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Finding the Fourth Proportional to 425,888.61, 639,226.57 and 215,674.17

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Solution

The fourth proportional to 425,888.61, 639,226.57 and 215,674.17 is: 323,710.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,888.61 : 639,226.57 = 215,674.17 : x
  2. Step 2: Convert to fraction form
    425,888.61/639,226.57 = 215,674.17/x
  3. Step 3: Cross multiply
    425,888.61x = 639,226.57 × 215,674.17
  4. Step 4: Simplify right side
    425,888.61x = 137,864,659,926.70
  5. Step 5: Solve for x
    x = 137,864,659,926.70/425,888.61
  6. Step 6: Final answer
    x = 323,710.61

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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.