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Finding the Fourth Proportional to 15,170.72, 20,935.28 and 8,456.19

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Solution

The fourth proportional to 15,170.72, 20,935.28 and 8,456.19 is: 11,669.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,170.72 : 20,935.28 = 8,456.19 : x
  2. Step 2: Convert to fraction form
    15,170.72/20,935.28 = 8,456.19/x
  3. Step 3: Cross multiply
    15,170.72x = 20,935.28 × 8,456.19
  4. Step 4: Simplify right side
    15,170.72x = 177,032,663.10
  5. Step 5: Solve for x
    x = 177,032,663.10/15,170.72
  6. Step 6: Final answer
    x = 11,669.37

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Half scale
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Double scale
Find fourth proportional to 15,171.72, 20,936.65 and 8,457.19
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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.