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Finding the Fourth Proportional to 1,109.70, 1,663.74 and 1,002.78

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Solution

The fourth proportional to 1,109.70, 1,663.74 and 1,002.78 is: 1,503.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.70 : 1,663.74 = 1,002.78 : x
  2. Step 2: Convert to fraction form
    1,109.70/1,663.74 = 1,002.78/x
  3. Step 3: Cross multiply
    1,109.70x = 1,663.74 × 1,002.78
  4. Step 4: Simplify right side
    1,109.70x = 1,668,365.20
  5. Step 5: Solve for x
    x = 1,668,365.20/1,109.70
  6. Step 6: Final answer
    x = 1,503.44

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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.