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Finding the Fourth Proportional to 612,205.70, 918,308.55 and 442,931.90

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Solution

The fourth proportional to 612,205.70, 918,308.55 and 442,931.90 is: 664,397.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,205.70 : 918,308.55 = 442,931.90 : x
  2. Step 2: Convert to fraction form
    612,205.70/918,308.55 = 442,931.90/x
  3. Step 3: Cross multiply
    612,205.70x = 918,308.55 × 442,931.90
  4. Step 4: Simplify right side
    612,205.70x = 406,748,150,837.75
  5. Step 5: Solve for x
    x = 406,748,150,837.75/612,205.70
  6. Step 6: Final answer
    x = 664,397.85

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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.