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Finding the Fourth Proportional to 431,780.80, 647,671.20 and 403,787.20

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Solution

The fourth proportional to 431,780.80, 647,671.20 and 403,787.20 is: 605,680.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,780.80 : 647,671.20 = 403,787.20 : x
  2. Step 2: Convert to fraction form
    431,780.80/647,671.20 = 403,787.20/x
  3. Step 3: Cross multiply
    431,780.80x = 647,671.20 × 403,787.20
  4. Step 4: Simplify right side
    431,780.80x = 261,521,340,368.64
  5. Step 5: Solve for x
    x = 261,521,340,368.64/431,780.80
  6. Step 6: Final answer
    x = 605,680.80

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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.