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Finding the Fourth Proportional to 489,142.40, 733,713.60 and 431,405.60

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Solution

The fourth proportional to 489,142.40, 733,713.60 and 431,405.60 is: 647,108.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,142.40 : 733,713.60 = 431,405.60 : x
  2. Step 2: Convert to fraction form
    489,142.40/733,713.60 = 431,405.60/x
  3. Step 3: Cross multiply
    489,142.40x = 733,713.60 × 431,405.60
  4. Step 4: Simplify right side
    489,142.40x = 316,528,155,836.16
  5. Step 5: Solve for x
    x = 316,528,155,836.16/489,142.40
  6. Step 6: Final answer
    x = 647,108.40

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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.