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Finding the Fourth Proportional to 542,121.31, 813,221.91 and 142,759.32

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Solution

The fourth proportional to 542,121.31, 813,221.91 and 142,759.32 is: 214,149.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    542,121.31 : 813,221.91 = 142,759.32 : x
  2. Step 2: Convert to fraction form
    542,121.31/813,221.91 = 142,759.32/x
  3. Step 3: Cross multiply
    542,121.31x = 813,221.91 × 142,759.32
  4. Step 4: Simplify right side
    542,121.31x = 116,095,006,880.70
  5. Step 5: Solve for x
    x = 116,095,006,880.70/542,121.31
  6. Step 6: Final answer
    x = 214,149.50

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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.