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Finding the Fourth Proportional to 941, 1,298.86 and 661.31

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Solution

The fourth proportional to 941, 1,298.86 and 661.31 is: 912.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    941 : 1,298.86 = 661.31 : x
  2. Step 2: Convert to fraction form
    941/1,298.86 = 661.31/x
  3. Step 3: Cross multiply
    941x = 1,298.86 × 661.31
  4. Step 4: Simplify right side
    941x = 858,949.11
  5. Step 5: Solve for x
    x = 858,949.11/941
  6. Step 6: Final answer
    x = 912.80

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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.