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Finding the Fourth Proportional to 21,237.71, 31,868.84 and 8,755.40

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Solution

The fourth proportional to 21,237.71, 31,868.84 and 8,755.40 is: 13,138.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,237.71 : 31,868.84 = 8,755.40 : x
  2. Step 2: Convert to fraction form
    21,237.71/31,868.84 = 8,755.40/x
  3. Step 3: Cross multiply
    21,237.71x = 31,868.84 × 8,755.40
  4. Step 4: Simplify right side
    21,237.71x = 279,024,543.30
  5. Step 5: Solve for x
    x = 279,024,543.30/21,237.71
  6. Step 6: Final answer
    x = 13,138.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.