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Finding the Fourth Proportional to 100,485.75, 138,670.88 and 62,781.87

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Solution

The fourth proportional to 100,485.75, 138,670.88 and 62,781.87 is: 86,639.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,485.75 : 138,670.88 = 62,781.87 : x
  2. Step 2: Convert to fraction form
    100,485.75/138,670.88 = 62,781.87/x
  3. Step 3: Cross multiply
    100,485.75x = 138,670.88 × 62,781.87
  4. Step 4: Simplify right side
    100,485.75x = 8,706,016,847.04
  5. Step 5: Solve for x
    x = 8,706,016,847.04/100,485.75
  6. Step 6: Final answer
    x = 86,639.32

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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.