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Finding the Fourth Proportional to 1,148.78, 1,722.20 and 499.02

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Solution

The fourth proportional to 1,148.78, 1,722.20 and 499.02 is: 748.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,148.78 : 1,722.20 = 499.02 : x
  2. Step 2: Convert to fraction form
    1,148.78/1,722.20 = 499.02/x
  3. Step 3: Cross multiply
    1,148.78x = 1,722.20 × 499.02
  4. Step 4: Simplify right side
    1,148.78x = 859,409.75
  5. Step 5: Solve for x
    x = 859,409.75/1,148.78
  6. Step 6: Final answer
    x = 748.11

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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.