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Finding the Fourth Proportional to 1,186.32, 1,780 and 724.46

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Solution

The fourth proportional to 1,186.32, 1,780 and 724.46 is: 1,087.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.32 : 1,780 = 724.46 : x
  2. Step 2: Convert to fraction form
    1,186.32/1,780 = 724.46/x
  3. Step 3: Cross multiply
    1,186.32x = 1,780 × 724.46
  4. Step 4: Simplify right side
    1,186.32x = 1,289,538.80
  5. Step 5: Solve for x
    x = 1,289,538.80/1,186.32
  6. Step 6: Final answer
    x = 1,087.01

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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.