Home / 1,312.20-1,799.08-1,288.78

Finding the Fourth Proportional to 1,312.20, 1,799.08 and 1,288.78

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Solution

The fourth proportional to 1,312.20, 1,799.08 and 1,288.78 is: 1,766.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.20 : 1,799.08 = 1,288.78 : x
  2. Step 2: Convert to fraction form
    1,312.20/1,799.08 = 1,288.78/x
  3. Step 3: Cross multiply
    1,312.20x = 1,799.08 × 1,288.78
  4. Step 4: Simplify right side
    1,312.20x = 2,318,610.60
  5. Step 5: Solve for x
    x = 2,318,610.60/1,312.20
  6. Step 6: Final answer
    x = 1,766.96

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.