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Finding the Fourth Proportional to 766.58, 1,148.38 and 458.69

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Solution

The fourth proportional to 766.58, 1,148.38 and 458.69 is: 687.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.58 : 1,148.38 = 458.69 : x
  2. Step 2: Convert to fraction form
    766.58/1,148.38 = 458.69/x
  3. Step 3: Cross multiply
    766.58x = 1,148.38 × 458.69
  4. Step 4: Simplify right side
    766.58x = 526,743.53
  5. Step 5: Solve for x
    x = 526,743.53/766.58
  6. Step 6: Final answer
    x = 687.14

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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.