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Finding the Fourth Proportional to 127,812.40, 191,718.60 and 71,825.20

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Solution

The fourth proportional to 127,812.40, 191,718.60 and 71,825.20 is: 107,737.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,812.40 : 191,718.60 = 71,825.20 : x
  2. Step 2: Convert to fraction form
    127,812.40/191,718.60 = 71,825.20/x
  3. Step 3: Cross multiply
    127,812.40x = 191,718.60 × 71,825.20
  4. Step 4: Simplify right side
    127,812.40x = 13,770,226,788.72
  5. Step 5: Solve for x
    x = 13,770,226,788.72/127,812.40
  6. Step 6: Final answer
    x = 107,737.80

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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.