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Finding the Fourth Proportional to 15,472.40, 21,338.16 and 12,487.28

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Solution

The fourth proportional to 15,472.40, 21,338.16 and 12,487.28 is: 17,221.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,472.40 : 21,338.16 = 12,487.28 : x
  2. Step 2: Convert to fraction form
    15,472.40/21,338.16 = 12,487.28/x
  3. Step 3: Cross multiply
    15,472.40x = 21,338.16 × 12,487.28
  4. Step 4: Simplify right side
    15,472.40x = 266,455,578.60
  5. Step 5: Solve for x
    x = 266,455,578.60/15,472.40
  6. Step 6: Final answer
    x = 17,221.35

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