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Finding the Fourth Proportional to 976.75, 1,347.41 and 661.91

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Solution

The fourth proportional to 976.75, 1,347.41 and 661.91 is: 913.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.75 : 1,347.41 = 661.91 : x
  2. Step 2: Convert to fraction form
    976.75/1,347.41 = 661.91/x
  3. Step 3: Cross multiply
    976.75x = 1,347.41 × 661.91
  4. Step 4: Simplify right side
    976.75x = 891,857.21
  5. Step 5: Solve for x
    x = 891,857.21/976.75
  6. Step 6: Final answer
    x = 913.09

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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.