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Finding the Fourth Proportional to 941.72, 1,298.21 and 661.10

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Solution

The fourth proportional to 941.72, 1,298.21 and 661.10 is: 911.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    941.72 : 1,298.21 = 661.10 : x
  2. Step 2: Convert to fraction form
    941.72/1,298.21 = 661.10/x
  3. Step 3: Cross multiply
    941.72x = 1,298.21 × 661.10
  4. Step 4: Simplify right side
    941.72x = 858,236.83
  5. Step 5: Solve for x
    x = 858,236.83/941.72
  6. Step 6: Final answer
    x = 911.36

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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.