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Finding the Fourth Proportional to 21,125.90, 29,123.68 and 14,402.90

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Solution

The fourth proportional to 21,125.90, 29,123.68 and 14,402.90 is: 19,855.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,125.90 : 29,123.68 = 14,402.90 : x
  2. Step 2: Convert to fraction form
    21,125.90/29,123.68 = 14,402.90/x
  3. Step 3: Cross multiply
    21,125.90x = 29,123.68 × 14,402.90
  4. Step 4: Simplify right side
    21,125.90x = 419,465,450.67
  5. Step 5: Solve for x
    x = 419,465,450.67/21,125.90
  6. Step 6: Final answer
    x = 19,855.51

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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.