Home / 1,639.28-2,454.60-868.16

Finding the Fourth Proportional to 1,639.28, 2,454.60 and 868.16

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Solution

The fourth proportional to 1,639.28, 2,454.60 and 868.16 is: 1,299.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.28 : 2,454.60 = 868.16 : x
  2. Step 2: Convert to fraction form
    1,639.28/2,454.60 = 868.16/x
  3. Step 3: Cross multiply
    1,639.28x = 2,454.60 × 868.16
  4. Step 4: Simplify right side
    1,639.28x = 2,130,985.54
  5. Step 5: Solve for x
    x = 2,130,985.54/1,639.28
  6. Step 6: Final answer
    x = 1,299.95

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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.