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Finding the Fourth Proportional to 521,574.60, 782,361.90 and 255,505.80

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Solution

The fourth proportional to 521,574.60, 782,361.90 and 255,505.80 is: 383,258.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,574.60 : 782,361.90 = 255,505.80 : x
  2. Step 2: Convert to fraction form
    521,574.60/782,361.90 = 255,505.80/x
  3. Step 3: Cross multiply
    521,574.60x = 782,361.90 × 255,505.80
  4. Step 4: Simplify right side
    521,574.60x = 199,898,003,149.02
  5. Step 5: Solve for x
    x = 199,898,003,149.02/521,574.60
  6. Step 6: Final answer
    x = 383,258.70

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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.