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Finding the Fourth Proportional to 426,167.40, 639,251.10 and 342,186.60

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Solution

The fourth proportional to 426,167.40, 639,251.10 and 342,186.60 is: 513,279.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,167.40 : 639,251.10 = 342,186.60 : x
  2. Step 2: Convert to fraction form
    426,167.40/639,251.10 = 342,186.60/x
  3. Step 3: Cross multiply
    426,167.40x = 639,251.10 × 342,186.60
  4. Step 4: Simplify right side
    426,167.40x = 218,743,160,455.26
  5. Step 5: Solve for x
    x = 218,743,160,455.26/426,167.40
  6. Step 6: Final answer
    x = 513,279.90

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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.