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Finding the Fourth Proportional to 718.65, 1,078.20 and 308.13

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Solution

The fourth proportional to 718.65, 1,078.20 and 308.13 is: 462.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.65 : 1,078.20 = 308.13 : x
  2. Step 2: Convert to fraction form
    718.65/1,078.20 = 308.13/x
  3. Step 3: Cross multiply
    718.65x = 1,078.20 × 308.13
  4. Step 4: Simplify right side
    718.65x = 332,225.77
  5. Step 5: Solve for x
    x = 332,225.77/718.65
  6. Step 6: Final answer
    x = 462.29

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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.