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Finding the Fourth Proportional to 280,087.57, 420,318.15 and 145,275.90

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Solution

The fourth proportional to 280,087.57, 420,318.15 and 145,275.90 is: 218,010.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,087.57 : 420,318.15 = 145,275.90 : x
  2. Step 2: Convert to fraction form
    280,087.57/420,318.15 = 145,275.90/x
  3. Step 3: Cross multiply
    280,087.57x = 420,318.15 × 145,275.90
  4. Step 4: Simplify right side
    280,087.57x = 61,062,095,425.99
  5. Step 5: Solve for x
    x = 61,062,095,425.99/280,087.57
  6. Step 6: Final answer
    x = 218,010.73

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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.