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Finding the Fourth Proportional to 612,214.20, 918,321.30 and 443,377.80

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Solution

The fourth proportional to 612,214.20, 918,321.30 and 443,377.80 is: 665,066.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,214.20 : 918,321.30 = 443,377.80 : x
  2. Step 2: Convert to fraction form
    612,214.20/918,321.30 = 443,377.80/x
  3. Step 3: Cross multiply
    612,214.20x = 918,321.30 × 443,377.80
  4. Step 4: Simplify right side
    612,214.20x = 407,163,277,687.14
  5. Step 5: Solve for x
    x = 407,163,277,687.14/612,214.20
  6. Step 6: Final answer
    x = 665,066.70

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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.