Home / 1,115.28-1,538.15-717.01

Finding the Fourth Proportional to 1,115.28, 1,538.15 and 717.01

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Solution

The fourth proportional to 1,115.28, 1,538.15 and 717.01 is: 988.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.28 : 1,538.15 = 717.01 : x
  2. Step 2: Convert to fraction form
    1,115.28/1,538.15 = 717.01/x
  3. Step 3: Cross multiply
    1,115.28x = 1,538.15 × 717.01
  4. Step 4: Simplify right side
    1,115.28x = 1,102,868.93
  5. Step 5: Solve for x
    x = 1,102,868.93/1,115.28
  6. Step 6: Final answer
    x = 988.87

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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.