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Finding the Fourth Proportional to 718.39, 1,078.80 and 712.72

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Solution

The fourth proportional to 718.39, 1,078.80 and 712.72 is: 1,070.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.39 : 1,078.80 = 712.72 : x
  2. Step 2: Convert to fraction form
    718.39/1,078.80 = 712.72/x
  3. Step 3: Cross multiply
    718.39x = 1,078.80 × 712.72
  4. Step 4: Simplify right side
    718.39x = 768,882.34
  5. Step 5: Solve for x
    x = 768,882.34/718.39
  6. Step 6: Final answer
    x = 1,070.29

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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.