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Finding the Fourth Proportional to 612,164.20, 918,246.30 and 442,890.40

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Solution

The fourth proportional to 612,164.20, 918,246.30 and 442,890.40 is: 664,335.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,164.20 : 918,246.30 = 442,890.40 : x
  2. Step 2: Convert to fraction form
    612,164.20/918,246.30 = 442,890.40/x
  3. Step 3: Cross multiply
    612,164.20x = 918,246.30 × 442,890.40
  4. Step 4: Simplify right side
    612,164.20x = 406,682,471,105.52
  5. Step 5: Solve for x
    x = 406,682,471,105.52/612,164.20
  6. Step 6: Final answer
    x = 664,335.60

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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.