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Finding the Fourth Proportional to 100,957.68, 139,319.80 and 55,017.72

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Solution

The fourth proportional to 100,957.68, 139,319.80 and 55,017.72 is: 75,923.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,957.68 : 139,319.80 = 55,017.72 : x
  2. Step 2: Convert to fraction form
    100,957.68/139,319.80 = 55,017.72/x
  3. Step 3: Cross multiply
    100,957.68x = 139,319.80 × 55,017.72
  4. Step 4: Simplify right side
    100,957.68x = 7,665,057,609.31
  5. Step 5: Solve for x
    x = 7,665,057,609.31/100,957.68
  6. Step 6: Final answer
    x = 75,923.47

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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.