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Finding the Fourth Proportional to 679.92, 1,014.48 and 615.12

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Solution

The fourth proportional to 679.92, 1,014.48 and 615.12 is: 917.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.92 : 1,014.48 = 615.12 : x
  2. Step 2: Convert to fraction form
    679.92/1,014.48 = 615.12/x
  3. Step 3: Cross multiply
    679.92x = 1,014.48 × 615.12
  4. Step 4: Simplify right side
    679.92x = 624,026.94
  5. Step 5: Solve for x
    x = 624,026.94/679.92
  6. Step 6: Final answer
    x = 917.79

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.