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Finding the Fourth Proportional to 718.91, 1,078.50 and 308.05

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Solution

The fourth proportional to 718.91, 1,078.50 and 308.05 is: 462.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.91 : 1,078.50 = 308.05 : x
  2. Step 2: Convert to fraction form
    718.91/1,078.50 = 308.05/x
  3. Step 3: Cross multiply
    718.91x = 1,078.50 × 308.05
  4. Step 4: Simplify right side
    718.91x = 332,231.93
  5. Step 5: Solve for x
    x = 332,231.93/718.91
  6. Step 6: Final answer
    x = 462.13

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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.