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Finding the Fourth Proportional to 1,186.75, 1,780.47 and 493.29

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Solution

The fourth proportional to 1,186.75, 1,780.47 and 493.29 is: 740.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.75 : 1,780.47 = 493.29 : x
  2. Step 2: Convert to fraction form
    1,186.75/1,780.47 = 493.29/x
  3. Step 3: Cross multiply
    1,186.75x = 1,780.47 × 493.29
  4. Step 4: Simplify right side
    1,186.75x = 878,288.05
  5. Step 5: Solve for x
    x = 878,288.05/1,186.75
  6. Step 6: Final answer
    x = 740.08

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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.