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Finding the Fourth Proportional to 83,987.80, 125,981.70 and 31,390.45

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Solution

The fourth proportional to 83,987.80, 125,981.70 and 31,390.45 is: 47,085.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,987.80 : 125,981.70 = 31,390.45 : x
  2. Step 2: Convert to fraction form
    83,987.80/125,981.70 = 31,390.45/x
  3. Step 3: Cross multiply
    83,987.80x = 125,981.70 × 31,390.45
  4. Step 4: Simplify right side
    83,987.80x = 3,954,622,254.77
  5. Step 5: Solve for x
    x = 3,954,622,254.77/83,987.80
  6. Step 6: Final answer
    x = 47,085.68

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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.