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Finding the Fourth Proportional to 395.62, 545.61 and 279.70

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Solution

The fourth proportional to 395.62, 545.61 and 279.70 is: 385.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.62 : 545.61 = 279.70 : x
  2. Step 2: Convert to fraction form
    395.62/545.61 = 279.70/x
  3. Step 3: Cross multiply
    395.62x = 545.61 × 279.70
  4. Step 4: Simplify right side
    395.62x = 152,607.12
  5. Step 5: Solve for x
    x = 152,607.12/395.62
  6. Step 6: Final answer
    x = 385.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.