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Finding the Fourth Proportional to 443,411.20, 665,116.80 and 256,326.40

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Solution

The fourth proportional to 443,411.20, 665,116.80 and 256,326.40 is: 384,489.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    443,411.20 : 665,116.80 = 256,326.40 : x
  2. Step 2: Convert to fraction form
    443,411.20/665,116.80 = 256,326.40/x
  3. Step 3: Cross multiply
    443,411.20x = 665,116.80 × 256,326.40
  4. Step 4: Simplify right side
    443,411.20x = 170,486,994,923.52
  5. Step 5: Solve for x
    x = 170,486,994,923.52/443,411.20
  6. Step 6: Final answer
    x = 384,489.60

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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.