Home / 78,711.87-118,036.49-28,780.59

Finding the Fourth Proportional to 78,711.87, 118,036.49 and 28,780.59

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Solution

The fourth proportional to 78,711.87, 118,036.49 and 28,780.59 is: 43,159.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,711.87 : 118,036.49 = 28,780.59 : x
  2. Step 2: Convert to fraction form
    78,711.87/118,036.49 = 28,780.59/x
  3. Step 3: Cross multiply
    78,711.87x = 118,036.49 × 28,780.59
  4. Step 4: Simplify right side
    78,711.87x = 3,397,159,679.83
  5. Step 5: Solve for x
    x = 3,397,159,679.83/78,711.87
  6. Step 6: Final answer
    x = 43,159.43

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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.