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Finding the Fourth Proportional to 15,615.76, 21,549.74 and 10,902.76

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Solution

The fourth proportional to 15,615.76, 21,549.74 and 10,902.76 is: 15,045.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,615.76 : 21,549.74 = 10,902.76 : x
  2. Step 2: Convert to fraction form
    15,615.76/21,549.74 = 10,902.76/x
  3. Step 3: Cross multiply
    15,615.76x = 21,549.74 × 10,902.76
  4. Step 4: Simplify right side
    15,615.76x = 234,951,643.28
  5. Step 5: Solve for x
    x = 234,951,643.28/15,615.76
  6. Step 6: Final answer
    x = 15,045.80

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Half scale
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Double scale
Find fourth proportional to 15,616.76, 21,551.12 and 10,903.76
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.