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Finding the Fourth Proportional to 679.59, 1,014.02 and 613.68

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Solution

The fourth proportional to 679.59, 1,014.02 and 613.68 is: 915.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.59 : 1,014.02 = 613.68 : x
  2. Step 2: Convert to fraction form
    679.59/1,014.02 = 613.68/x
  3. Step 3: Cross multiply
    679.59x = 1,014.02 × 613.68
  4. Step 4: Simplify right side
    679.59x = 622,279.22
  5. Step 5: Solve for x
    x = 622,279.22/679.59
  6. Step 6: Final answer
    x = 915.67

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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.