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Finding the Fourth Proportional to 392,428.80, 588,686.40 and 143,164.80

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Solution

The fourth proportional to 392,428.80, 588,686.40 and 143,164.80 is: 214,762.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    392,428.80 : 588,686.40 = 143,164.80 : x
  2. Step 2: Convert to fraction form
    392,428.80/588,686.40 = 143,164.80/x
  3. Step 3: Cross multiply
    392,428.80x = 588,686.40 × 143,164.80
  4. Step 4: Simplify right side
    392,428.80x = 84,279,170,718.72
  5. Step 5: Solve for x
    x = 84,279,170,718.72/392,428.80
  6. Step 6: Final answer
    x = 214,762.96

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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.