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Finding the Fourth Proportional to 28,887, 39,864.12 and 15,639

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Solution

The fourth proportional to 28,887, 39,864.12 and 15,639 is: 21,581.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,887 : 39,864.12 = 15,639 : x
  2. Step 2: Convert to fraction form
    28,887/39,864.12 = 15,639/x
  3. Step 3: Cross multiply
    28,887x = 39,864.12 × 15,639
  4. Step 4: Simplify right side
    28,887x = 623,434,972.68
  5. Step 5: Solve for x
    x = 623,434,972.68/28,887
  6. Step 6: Final answer
    x = 21,581.85

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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.