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Finding the Fourth Proportional to 458,280.80, 687,421.20 and 399,231.80

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Solution

The fourth proportional to 458,280.80, 687,421.20 and 399,231.80 is: 598,847.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,280.80 : 687,421.20 = 399,231.80 : x
  2. Step 2: Convert to fraction form
    458,280.80/687,421.20 = 399,231.80/x
  3. Step 3: Cross multiply
    458,280.80x = 687,421.20 × 399,231.80
  4. Step 4: Simplify right side
    458,280.80x = 274,440,403,034.16
  5. Step 5: Solve for x
    x = 274,440,403,034.16/458,280.80
  6. Step 6: Final answer
    x = 598,847.70

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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.