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Finding the Fourth Proportional to 1,186.62, 1,780.08 and 456.84

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Solution

The fourth proportional to 1,186.62, 1,780.08 and 456.84 is: 685.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.62 : 1,780.08 = 456.84 : x
  2. Step 2: Convert to fraction form
    1,186.62/1,780.08 = 456.84/x
  3. Step 3: Cross multiply
    1,186.62x = 1,780.08 × 456.84
  4. Step 4: Simplify right side
    1,186.62x = 813,211.75
  5. Step 5: Solve for x
    x = 813,211.75/1,186.62
  6. Step 6: Final answer
    x = 685.32

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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.