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Finding the Fourth Proportional to 976, 1,347.60 and 664.96

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Solution

The fourth proportional to 976, 1,347.60 and 664.96 is: 918.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    976 : 1,347.60 = 664.96 : x
  2. Step 2: Convert to fraction form
    976/1,347.60 = 664.96/x
  3. Step 3: Cross multiply
    976x = 1,347.60 × 664.96
  4. Step 4: Simplify right side
    976x = 896,100.10
  5. Step 5: Solve for x
    x = 896,100.10/976
  6. Step 6: Final answer
    x = 918.14

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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.