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Finding the Fourth Proportional to 431,640.20, 647,460.30 and 428,875.40

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Solution

The fourth proportional to 431,640.20, 647,460.30 and 428,875.40 is: 643,313.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,640.20 : 647,460.30 = 428,875.40 : x
  2. Step 2: Convert to fraction form
    431,640.20/647,460.30 = 428,875.40/x
  3. Step 3: Cross multiply
    431,640.20x = 647,460.30 × 428,875.40
  4. Step 4: Simplify right side
    431,640.20x = 277,679,795,146.62
  5. Step 5: Solve for x
    x = 277,679,795,146.62/431,640.20
  6. Step 6: Final answer
    x = 643,313.10

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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.