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Finding the Fourth Proportional to 81,587.71, 122,351.66 and 28,265.91

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Solution

The fourth proportional to 81,587.71, 122,351.66 and 28,265.91 is: 42,388.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,587.71 : 122,351.66 = 28,265.91 : x
  2. Step 2: Convert to fraction form
    81,587.71/122,351.66 = 28,265.91/x
  3. Step 3: Cross multiply
    81,587.71x = 122,351.66 × 28,265.91
  4. Step 4: Simplify right side
    81,587.71x = 3,458,381,184.11
  5. Step 5: Solve for x
    x = 3,458,381,184.11/81,587.71
  6. Step 6: Final answer
    x = 42,388.51

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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.