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Finding the Fourth Proportional to 718.66, 1,079.80 and 458.78

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Solution

The fourth proportional to 718.66, 1,079.80 and 458.78 is: 689.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.66 : 1,079.80 = 458.78 : x
  2. Step 2: Convert to fraction form
    718.66/1,079.80 = 458.78/x
  3. Step 3: Cross multiply
    718.66x = 1,079.80 × 458.78
  4. Step 4: Simplify right side
    718.66x = 495,390.64
  5. Step 5: Solve for x
    x = 495,390.64/718.66
  6. Step 6: Final answer
    x = 689.33

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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.