Home / 1,225.40-1,689.46-1,102.38

Finding the Fourth Proportional to 1,225.40, 1,689.46 and 1,102.38

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Solution

The fourth proportional to 1,225.40, 1,689.46 and 1,102.38 is: 1,519.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.40 : 1,689.46 = 1,102.38 : x
  2. Step 2: Convert to fraction form
    1,225.40/1,689.46 = 1,102.38/x
  3. Step 3: Cross multiply
    1,225.40x = 1,689.46 × 1,102.38
  4. Step 4: Simplify right side
    1,225.40x = 1,862,432.08
  5. Step 5: Solve for x
    x = 1,862,432.08/1,225.40
  6. Step 6: Final answer
    x = 1,519.85

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Double scale
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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.