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Finding the Fourth Proportional to 1,449.38, 2,000.40 and 860.24

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Solution

The fourth proportional to 1,449.38, 2,000.40 and 860.24 is: 1,187.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,449.38 : 2,000.40 = 860.24 : x
  2. Step 2: Convert to fraction form
    1,449.38/2,000.40 = 860.24/x
  3. Step 3: Cross multiply
    1,449.38x = 2,000.40 × 860.24
  4. Step 4: Simplify right side
    1,449.38x = 1,720,824.10
  5. Step 5: Solve for x
    x = 1,720,824.10/1,449.38
  6. Step 6: Final answer
    x = 1,187.28

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1.5x scale

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.