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Finding the Fourth Proportional to 72,149.81, 108,246.56 and 51,130.58

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Solution

The fourth proportional to 72,149.81, 108,246.56 and 51,130.58 is: 76,711.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,149.81 : 108,246.56 = 51,130.58 : x
  2. Step 2: Convert to fraction form
    72,149.81/108,246.56 = 51,130.58/x
  3. Step 3: Cross multiply
    72,149.81x = 108,246.56 × 51,130.58
  4. Step 4: Simplify right side
    72,149.81x = 5,534,708,598.92
  5. Step 5: Solve for x
    x = 5,534,708,598.92/72,149.81
  6. Step 6: Final answer
    x = 76,711.35

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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.