Home / 15,428.40-21,290.94-8,354.76

Finding the Fourth Proportional to 15,428.40, 21,290.94 and 8,354.76

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Solution

The fourth proportional to 15,428.40, 21,290.94 and 8,354.76 is: 11,529.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,428.40 : 21,290.94 = 8,354.76 : x
  2. Step 2: Convert to fraction form
    15,428.40/21,290.94 = 8,354.76/x
  3. Step 3: Cross multiply
    15,428.40x = 21,290.94 × 8,354.76
  4. Step 4: Simplify right side
    15,428.40x = 177,880,693.87
  5. Step 5: Solve for x
    x = 177,880,693.87/15,428.40
  6. Step 6: Final answer
    x = 11,529.43

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Half scale
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Double scale
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Similar ratio
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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.