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Finding the Fourth Proportional to 718,702.88, 991,805.92 and 396,412.20

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Solution

The fourth proportional to 718,702.88, 991,805.92 and 396,412.20 is: 547,046.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,702.88 : 991,805.92 = 396,412.20 : x
  2. Step 2: Convert to fraction form
    718,702.88/991,805.92 = 396,412.20/x
  3. Step 3: Cross multiply
    718,702.88x = 991,805.92 × 396,412.20
  4. Step 4: Simplify right side
    718,702.88x = 393,163,966,720.22
  5. Step 5: Solve for x
    x = 393,163,966,720.22/718,702.88
  6. Step 6: Final answer
    x = 547,046.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.