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Finding the Fourth Proportional to 979.49, 1,352.27 and 870.14

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Solution

The fourth proportional to 979.49, 1,352.27 and 870.14 is: 1,201.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.49 : 1,352.27 = 870.14 : x
  2. Step 2: Convert to fraction form
    979.49/1,352.27 = 870.14/x
  3. Step 3: Cross multiply
    979.49x = 1,352.27 × 870.14
  4. Step 4: Simplify right side
    979.49x = 1,176,659.63
  5. Step 5: Solve for x
    x = 1,176,659.63/979.49
  6. Step 6: Final answer
    x = 1,201.30

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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.