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Finding the Fourth Proportional to 1,187.78, 1,780.91 and 494.93

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Solution

The fourth proportional to 1,187.78, 1,780.91 and 494.93 is: 742.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.78 : 1,780.91 = 494.93 : x
  2. Step 2: Convert to fraction form
    1,187.78/1,780.91 = 494.93/x
  3. Step 3: Cross multiply
    1,187.78x = 1,780.91 × 494.93
  4. Step 4: Simplify right side
    1,187.78x = 881,425.79
  5. Step 5: Solve for x
    x = 881,425.79/1,187.78
  6. Step 6: Final answer
    x = 742.08

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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.