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Finding the Fourth Proportional to 392,728.75, 588,543.88 and 212,424.79

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Solution

The fourth proportional to 392,728.75, 588,543.88 and 212,424.79 is: 318,340.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    392,728.75 : 588,543.88 = 212,424.79 : x
  2. Step 2: Convert to fraction form
    392,728.75/588,543.88 = 212,424.79/x
  3. Step 3: Cross multiply
    392,728.75x = 588,543.88 × 212,424.79
  4. Step 4: Simplify right side
    392,728.75x = 125,021,310,114.79
  5. Step 5: Solve for x
    x = 125,021,310,114.79/392,728.75
  6. Step 6: Final answer
    x = 318,340.10

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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.