Home / 1,288.60-1,778.95-1,008.24

Finding the Fourth Proportional to 1,288.60, 1,778.95 and 1,008.24

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Solution

The fourth proportional to 1,288.60, 1,778.95 and 1,008.24 is: 1,391.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.60 : 1,778.95 = 1,008.24 : x
  2. Step 2: Convert to fraction form
    1,288.60/1,778.95 = 1,008.24/x
  3. Step 3: Cross multiply
    1,288.60x = 1,778.95 × 1,008.24
  4. Step 4: Simplify right side
    1,288.60x = 1,793,608.55
  5. Step 5: Solve for x
    x = 1,793,608.55/1,288.60
  6. Step 6: Final answer
    x = 1,391.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.