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Finding the Fourth Proportional to 753.18, 1,039.58 and 679.38

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Solution

The fourth proportional to 753.18, 1,039.58 and 679.38 is: 937.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.18 : 1,039.58 = 679.38 : x
  2. Step 2: Convert to fraction form
    753.18/1,039.58 = 679.38/x
  3. Step 3: Cross multiply
    753.18x = 1,039.58 × 679.38
  4. Step 4: Simplify right side
    753.18x = 706,269.86
  5. Step 5: Solve for x
    x = 706,269.86/753.18
  6. Step 6: Final answer
    x = 937.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.