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Finding the Fourth Proportional to 718.34, 1,076.96 and 458.60

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Solution

The fourth proportional to 718.34, 1,076.96 and 458.60 is: 687.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.34 : 1,076.96 = 458.60 : x
  2. Step 2: Convert to fraction form
    718.34/1,076.96 = 458.60/x
  3. Step 3: Cross multiply
    718.34x = 1,076.96 × 458.60
  4. Step 4: Simplify right side
    718.34x = 493,893.86
  5. Step 5: Solve for x
    x = 493,893.86/718.34
  6. Step 6: Final answer
    x = 687.55

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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.