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Finding the Fourth Proportional to 487,858.40, 731,787.60 and 320,436.80

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Solution

The fourth proportional to 487,858.40, 731,787.60 and 320,436.80 is: 480,655.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,858.40 : 731,787.60 = 320,436.80 : x
  2. Step 2: Convert to fraction form
    487,858.40/731,787.60 = 320,436.80/x
  3. Step 3: Cross multiply
    487,858.40x = 731,787.60 × 320,436.80
  4. Step 4: Simplify right side
    487,858.40x = 234,491,676,823.68
  5. Step 5: Solve for x
    x = 234,491,676,823.68/487,858.40
  6. Step 6: Final answer
    x = 480,655.20

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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.