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Finding the Fourth Proportional to 979.28, 1,351.28 and 537.15

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Solution

The fourth proportional to 979.28, 1,351.28 and 537.15 is: 741.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.28 : 1,351.28 = 537.15 : x
  2. Step 2: Convert to fraction form
    979.28/1,351.28 = 537.15/x
  3. Step 3: Cross multiply
    979.28x = 1,351.28 × 537.15
  4. Step 4: Simplify right side
    979.28x = 725,840.05
  5. Step 5: Solve for x
    x = 725,840.05/979.28
  6. Step 6: Final answer
    x = 741.20

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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.