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Finding the Fourth Proportional to 259,517.60, 389,276.40 and 215,280.80

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Solution

The fourth proportional to 259,517.60, 389,276.40 and 215,280.80 is: 322,921.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,517.60 : 389,276.40 = 215,280.80 : x
  2. Step 2: Convert to fraction form
    259,517.60/389,276.40 = 215,280.80/x
  3. Step 3: Cross multiply
    259,517.60x = 389,276.40 × 215,280.80
  4. Step 4: Simplify right side
    259,517.60x = 83,803,734,813.12
  5. Step 5: Solve for x
    x = 83,803,734,813.12/259,517.60
  6. Step 6: Final answer
    x = 322,921.20

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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.