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Finding the Fourth Proportional to 1,534.61, 2,117.78 and 871.48

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Solution

The fourth proportional to 1,534.61, 2,117.78 and 871.48 is: 1,202.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,534.61 : 2,117.78 = 871.48 : x
  2. Step 2: Convert to fraction form
    1,534.61/2,117.78 = 871.48/x
  3. Step 3: Cross multiply
    1,534.61x = 2,117.78 × 871.48
  4. Step 4: Simplify right side
    1,534.61x = 1,845,589.29
  5. Step 5: Solve for x
    x = 1,845,589.29/1,534.61
  6. Step 6: Final answer
    x = 1,202.64

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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.