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Finding the Fourth Proportional to 871.58, 1,201.40 and 661.08

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Solution

The fourth proportional to 871.58, 1,201.40 and 661.08 is: 911.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.58 : 1,201.40 = 661.08 : x
  2. Step 2: Convert to fraction form
    871.58/1,201.40 = 661.08/x
  3. Step 3: Cross multiply
    871.58x = 1,201.40 × 661.08
  4. Step 4: Simplify right side
    871.58x = 794,218.21
  5. Step 5: Solve for x
    x = 794,218.21/871.58
  6. Step 6: Final answer
    x = 911.24

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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.