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Finding the Fourth Proportional to 1,100.40, 1,650.64 and 278.76

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Solution

The fourth proportional to 1,100.40, 1,650.64 and 278.76 is: 418.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,100.40 : 1,650.64 = 278.76 : x
  2. Step 2: Convert to fraction form
    1,100.40/1,650.64 = 278.76/x
  3. Step 3: Cross multiply
    1,100.40x = 1,650.64 × 278.76
  4. Step 4: Simplify right side
    1,100.40x = 460,132.41
  5. Step 5: Solve for x
    x = 460,132.41/1,100.40
  6. Step 6: Final answer
    x = 418.15

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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.