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Finding the Fourth Proportional to 976.49, 1,348.14 and 645.47

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Solution

The fourth proportional to 976.49, 1,348.14 and 645.47 is: 891.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.49 : 1,348.14 = 645.47 : x
  2. Step 2: Convert to fraction form
    976.49/1,348.14 = 645.47/x
  3. Step 3: Cross multiply
    976.49x = 1,348.14 × 645.47
  4. Step 4: Simplify right side
    976.49x = 870,177.19
  5. Step 5: Solve for x
    x = 870,177.19/976.49
  6. Step 6: Final answer
    x = 891.13

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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.