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Finding the Fourth Proportional to 518,620.80, 777,931.20 and 431,140.80

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Solution

The fourth proportional to 518,620.80, 777,931.20 and 431,140.80 is: 646,711.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,620.80 : 777,931.20 = 431,140.80 : x
  2. Step 2: Convert to fraction form
    518,620.80/777,931.20 = 431,140.80/x
  3. Step 3: Cross multiply
    518,620.80x = 777,931.20 × 431,140.80
  4. Step 4: Simplify right side
    518,620.80x = 335,397,879,912.96
  5. Step 5: Solve for x
    x = 335,397,879,912.96/518,620.80
  6. Step 6: Final answer
    x = 646,711.20

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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.