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Finding the Fourth Proportional to 431,617.40, 647,426.10 and 282,318.20

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Solution

The fourth proportional to 431,617.40, 647,426.10 and 282,318.20 is: 423,477.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,617.40 : 647,426.10 = 282,318.20 : x
  2. Step 2: Convert to fraction form
    431,617.40/647,426.10 = 282,318.20/x
  3. Step 3: Cross multiply
    431,617.40x = 647,426.10 × 282,318.20
  4. Step 4: Simplify right side
    431,617.40x = 182,780,171,185.02
  5. Step 5: Solve for x
    x = 182,780,171,185.02/431,617.40
  6. Step 6: Final answer
    x = 423,477.30

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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.