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Finding the Fourth Proportional to 979.38, 1,470.29 and 760.68

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Solution

The fourth proportional to 979.38, 1,470.29 and 760.68 is: 1,141.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.38 : 1,470.29 = 760.68 : x
  2. Step 2: Convert to fraction form
    979.38/1,470.29 = 760.68/x
  3. Step 3: Cross multiply
    979.38x = 1,470.29 × 760.68
  4. Step 4: Simplify right side
    979.38x = 1,118,416.39
  5. Step 5: Solve for x
    x = 1,118,416.39/979.38
  6. Step 6: Final answer
    x = 1,141.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.