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Finding the Fourth Proportional to 979.85, 1,352.19 and 537.75

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Solution

The fourth proportional to 979.85, 1,352.19 and 537.75 is: 742.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.85 : 1,352.19 = 537.75 : x
  2. Step 2: Convert to fraction form
    979.85/1,352.19 = 537.75/x
  3. Step 3: Cross multiply
    979.85x = 1,352.19 × 537.75
  4. Step 4: Simplify right side
    979.85x = 727,139.50
  5. Step 5: Solve for x
    x = 727,139.50/979.85
  6. Step 6: Final answer
    x = 742.10

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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.