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Finding the Fourth Proportional to 2,478.78, 3,717.90 and 747.36

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Solution

The fourth proportional to 2,478.78, 3,717.90 and 747.36 is: 1,120.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,478.78 : 3,717.90 = 747.36 : x
  2. Step 2: Convert to fraction form
    2,478.78/3,717.90 = 747.36/x
  3. Step 3: Cross multiply
    2,478.78x = 3,717.90 × 747.36
  4. Step 4: Simplify right side
    2,478.78x = 2,778,609.74
  5. Step 5: Solve for x
    x = 2,778,609.74/2,478.78
  6. Step 6: Final answer
    x = 1,120.96

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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.