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Finding the Fourth Proportional to 718.10, 1,078.97 and 458.22

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Solution

The fourth proportional to 718.10, 1,078.97 and 458.22 is: 688.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.10 : 1,078.97 = 458.22 : x
  2. Step 2: Convert to fraction form
    718.10/1,078.97 = 458.22/x
  3. Step 3: Cross multiply
    718.10x = 1,078.97 × 458.22
  4. Step 4: Simplify right side
    718.10x = 494,403.34
  5. Step 5: Solve for x
    x = 494,403.34/718.10
  6. Step 6: Final answer
    x = 688.49

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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.