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Finding the Fourth Proportional to 880.69, 1,318.20 and 616.72

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Solution

The fourth proportional to 880.69, 1,318.20 and 616.72 is: 923.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.69 : 1,318.20 = 616.72 : x
  2. Step 2: Convert to fraction form
    880.69/1,318.20 = 616.72/x
  3. Step 3: Cross multiply
    880.69x = 1,318.20 × 616.72
  4. Step 4: Simplify right side
    880.69x = 812,960.30
  5. Step 5: Solve for x
    x = 812,960.30/880.69
  6. Step 6: Final answer
    x = 923.09

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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.