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Finding the Fourth Proportional to 100,670.31, 138,925.31 and 55,352.93

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Solution

The fourth proportional to 100,670.31, 138,925.31 and 55,352.93 is: 76,387.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,670.31 : 138,925.31 = 55,352.93 : x
  2. Step 2: Convert to fraction form
    100,670.31/138,925.31 = 55,352.93/x
  3. Step 3: Cross multiply
    100,670.31x = 138,925.31 × 55,352.93
  4. Step 4: Simplify right side
    100,670.31x = 7,689,921,988.27
  5. Step 5: Solve for x
    x = 7,689,921,988.27/100,670.31
  6. Step 6: Final answer
    x = 76,387.19

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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.