Home / 78,821.91-118,240.20-31,425.53

Finding the Fourth Proportional to 78,821.91, 118,240.20 and 31,425.53

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Solution

The fourth proportional to 78,821.91, 118,240.20 and 31,425.53 is: 47,141.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,821.91 : 118,240.20 = 31,425.53 : x
  2. Step 2: Convert to fraction form
    78,821.91/118,240.20 = 31,425.53/x
  3. Step 3: Cross multiply
    78,821.91x = 118,240.20 × 31,425.53
  4. Step 4: Simplify right side
    78,821.91x = 3,715,760,361.11
  5. Step 5: Solve for x
    x = 3,715,760,361.11/78,821.91
  6. Step 6: Final answer
    x = 47,141.21

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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.