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Finding the Fourth Proportional to 1,049.32, 1,571.10 and 661.96

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Solution

The fourth proportional to 1,049.32, 1,571.10 and 661.96 is: 991.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,049.32 : 1,571.10 = 661.96 : x
  2. Step 2: Convert to fraction form
    1,049.32/1,571.10 = 661.96/x
  3. Step 3: Cross multiply
    1,049.32x = 1,571.10 × 661.96
  4. Step 4: Simplify right side
    1,049.32x = 1,040,005.36
  5. Step 5: Solve for x
    x = 1,040,005.36/1,049.32
  6. Step 6: Final answer
    x = 991.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.