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Finding the Fourth Proportional to 1,209.78, 1,815.48 and 440.28

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Solution

The fourth proportional to 1,209.78, 1,815.48 and 440.28 is: 660.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.78 : 1,815.48 = 440.28 : x
  2. Step 2: Convert to fraction form
    1,209.78/1,815.48 = 440.28/x
  3. Step 3: Cross multiply
    1,209.78x = 1,815.48 × 440.28
  4. Step 4: Simplify right side
    1,209.78x = 799,319.53
  5. Step 5: Solve for x
    x = 799,319.53/1,209.78
  6. Step 6: Final answer
    x = 660.71

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1.5x scale

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.