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Finding the Fourth Proportional to 612,122.20, 918,183.30 and 442,848.40

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Solution

The fourth proportional to 612,122.20, 918,183.30 and 442,848.40 is: 664,272.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,122.20 : 918,183.30 = 442,848.40 : x
  2. Step 2: Convert to fraction form
    612,122.20/918,183.30 = 442,848.40/x
  3. Step 3: Cross multiply
    612,122.20x = 918,183.30 × 442,848.40
  4. Step 4: Simplify right side
    612,122.20x = 406,616,005,311.72
  5. Step 5: Solve for x
    x = 406,616,005,311.72/612,122.20
  6. Step 6: Final answer
    x = 664,272.60

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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.