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Finding the Fourth Proportional to 410,187.20, 615,280.80 and 129,790.40

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Solution

The fourth proportional to 410,187.20, 615,280.80 and 129,790.40 is: 194,685.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    410,187.20 : 615,280.80 = 129,790.40 : x
  2. Step 2: Convert to fraction form
    410,187.20/615,280.80 = 129,790.40/x
  3. Step 3: Cross multiply
    410,187.20x = 615,280.80 × 129,790.40
  4. Step 4: Simplify right side
    410,187.20x = 79,857,541,144.32
  5. Step 5: Solve for x
    x = 79,857,541,144.32/410,187.20
  6. Step 6: Final answer
    x = 194,685.60

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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.