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Finding the Fourth Proportional to 871.78, 1,203.22 and 661.59

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Solution

The fourth proportional to 871.78, 1,203.22 and 661.59 is: 913.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.78 : 1,203.22 = 661.59 : x
  2. Step 2: Convert to fraction form
    871.78/1,203.22 = 661.59/x
  3. Step 3: Cross multiply
    871.78x = 1,203.22 × 661.59
  4. Step 4: Simplify right side
    871.78x = 796,038.32
  5. Step 5: Solve for x
    x = 796,038.32/871.78
  6. Step 6: Final answer
    x = 913.12

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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.