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Finding the Fourth Proportional to 545,821.20, 818,731.80 and 431,659.80

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Solution

The fourth proportional to 545,821.20, 818,731.80 and 431,659.80 is: 647,489.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    545,821.20 : 818,731.80 = 431,659.80 : x
  2. Step 2: Convert to fraction form
    545,821.20/818,731.80 = 431,659.80/x
  3. Step 3: Cross multiply
    545,821.20x = 818,731.80 × 431,659.80
  4. Step 4: Simplify right side
    545,821.20x = 353,413,605,041.64
  5. Step 5: Solve for x
    x = 353,413,605,041.64/545,821.20
  6. Step 6: Final answer
    x = 647,489.70

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Double scale
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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.