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Finding the Fourth Proportional to 28,716, 39,630.51 and 16,143.18

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Solution

The fourth proportional to 28,716, 39,630.51 and 16,143.18 is: 22,278.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,716 : 39,630.51 = 16,143.18 : x
  2. Step 2: Convert to fraction form
    28,716/39,630.51 = 16,143.18/x
  3. Step 3: Cross multiply
    28,716x = 39,630.51 × 16,143.18
  4. Step 4: Simplify right side
    28,716x = 639,762,456.42
  5. Step 5: Solve for x
    x = 639,762,456.42/28,716
  6. Step 6: Final answer
    x = 22,278.95

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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.