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Finding the Fourth Proportional to 21,291.17, 29,366.08 and 15,624

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Solution

The fourth proportional to 21,291.17, 29,366.08 and 15,624 is: 21,549.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,291.17 : 29,366.08 = 15,624 : x
  2. Step 2: Convert to fraction form
    21,291.17/29,366.08 = 15,624/x
  3. Step 3: Cross multiply
    21,291.17x = 29,366.08 × 15,624
  4. Step 4: Simplify right side
    21,291.17x = 458,815,594.86
  5. Step 5: Solve for x
    x = 458,815,594.86/21,291.17
  6. Step 6: Final answer
    x = 21,549.58

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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.