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Finding the Fourth Proportional to 431,551.80, 647,327.70 and 260,309.70

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Solution

The fourth proportional to 431,551.80, 647,327.70 and 260,309.70 is: 390,464.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,551.80 : 647,327.70 = 260,309.70 : x
  2. Step 2: Convert to fraction form
    431,551.80/647,327.70 = 260,309.70/x
  3. Step 3: Cross multiply
    431,551.80x = 647,327.70 × 260,309.70
  4. Step 4: Simplify right side
    431,551.80x = 168,505,679,388.69
  5. Step 5: Solve for x
    x = 168,505,679,388.69/431,551.80
  6. Step 6: Final answer
    x = 390,464.55

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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.