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Finding the Fourth Proportional to 431,937.20, 647,905.80 and 207,259.40

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Solution

The fourth proportional to 431,937.20, 647,905.80 and 207,259.40 is: 310,889.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,937.20 : 647,905.80 = 207,259.40 : x
  2. Step 2: Convert to fraction form
    431,937.20/647,905.80 = 207,259.40/x
  3. Step 3: Cross multiply
    431,937.20x = 647,905.80 × 207,259.40
  4. Step 4: Simplify right side
    431,937.20x = 134,284,567,364.52
  5. Step 5: Solve for x
    x = 134,284,567,364.52/431,937.20
  6. Step 6: Final answer
    x = 310,889.10

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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.