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Finding the Fourth Proportional to 611,815.70, 917,723.55 and 442,979.30

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Solution

The fourth proportional to 611,815.70, 917,723.55 and 442,979.30 is: 664,468.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,815.70 : 917,723.55 = 442,979.30 : x
  2. Step 2: Convert to fraction form
    611,815.70/917,723.55 = 442,979.30/x
  3. Step 3: Cross multiply
    611,815.70x = 917,723.55 × 442,979.30
  4. Step 4: Simplify right side
    611,815.70x = 406,532,535,772.52
  5. Step 5: Solve for x
    x = 406,532,535,772.52/611,815.70
  6. Step 6: Final answer
    x = 664,468.95

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Double scale
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Similar ratio
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1.5x scale

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.