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Finding the Fourth Proportional to 718.13, 1,076.31 and 511.58

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Solution

The fourth proportional to 718.13, 1,076.31 and 511.58 is: 766.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.13 : 1,076.31 = 511.58 : x
  2. Step 2: Convert to fraction form
    718.13/1,076.31 = 511.58/x
  3. Step 3: Cross multiply
    718.13x = 1,076.31 × 511.58
  4. Step 4: Simplify right side
    718.13x = 550,613.29
  5. Step 5: Solve for x
    x = 550,613.29/718.13
  6. Step 6: Final answer
    x = 766.74

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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.