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Finding the Fourth Proportional to 100,741.55, 139,007.90 and 58,291.88

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Solution

The fourth proportional to 100,741.55, 139,007.90 and 58,291.88 is: 80,433.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,741.55 : 139,007.90 = 58,291.88 : x
  2. Step 2: Convert to fraction form
    100,741.55/139,007.90 = 58,291.88/x
  3. Step 3: Cross multiply
    100,741.55x = 139,007.90 × 58,291.88
  4. Step 4: Simplify right side
    100,741.55x = 8,103,031,276.54
  5. Step 5: Solve for x
    x = 8,103,031,276.54/100,741.55
  6. Step 6: Final answer
    x = 80,433.86

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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.