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Finding the Fourth Proportional to 21,421.87, 29,553.02 and 12,919.15

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Solution

The fourth proportional to 21,421.87, 29,553.02 and 12,919.15 is: 17,822.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,421.87 : 29,553.02 = 12,919.15 : x
  2. Step 2: Convert to fraction form
    21,421.87/29,553.02 = 12,919.15/x
  3. Step 3: Cross multiply
    21,421.87x = 29,553.02 × 12,919.15
  4. Step 4: Simplify right side
    21,421.87x = 381,799,965.91
  5. Step 5: Solve for x
    x = 381,799,965.91/21,421.87
  6. Step 6: Final answer
    x = 17,822.91

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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.