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Finding the Fourth Proportional to 985.05, 1,476.22 and 545.65

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Solution

The fourth proportional to 985.05, 1,476.22 and 545.65 is: 817.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.05 : 1,476.22 = 545.65 : x
  2. Step 2: Convert to fraction form
    985.05/1,476.22 = 545.65/x
  3. Step 3: Cross multiply
    985.05x = 1,476.22 × 545.65
  4. Step 4: Simplify right side
    985.05x = 805,489.33
  5. Step 5: Solve for x
    x = 805,489.33/985.05
  6. Step 6: Final answer
    x = 817.71

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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.