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Finding the Fourth Proportional to 942.40, 1,299.14 and 661.79

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Solution

The fourth proportional to 942.40, 1,299.14 and 661.79 is: 912.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.40 : 1,299.14 = 661.79 : x
  2. Step 2: Convert to fraction form
    942.40/1,299.14 = 661.79/x
  3. Step 3: Cross multiply
    942.40x = 1,299.14 × 661.79
  4. Step 4: Simplify right side
    942.40x = 859,757.86
  5. Step 5: Solve for x
    x = 859,757.86/942.40
  6. Step 6: Final answer
    x = 912.31

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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.