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Finding the Fourth Proportional to 612,605.70, 918,908.55 and 443,331.90

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Solution

The fourth proportional to 612,605.70, 918,908.55 and 443,331.90 is: 664,997.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,605.70 : 918,908.55 = 443,331.90 : x
  2. Step 2: Convert to fraction form
    612,605.70/918,908.55 = 443,331.90/x
  3. Step 3: Cross multiply
    612,605.70x = 918,908.55 × 443,331.90
  4. Step 4: Simplify right side
    612,605.70x = 407,381,473,397.75
  5. Step 5: Solve for x
    x = 407,381,473,397.75/612,605.70
  6. Step 6: Final answer
    x = 664,997.85

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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.