Home / 10,639.60-15,959.40-5,390.80

Finding the Fourth Proportional to 10,639.60, 15,959.40 and 5,390.80

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Solution

The fourth proportional to 10,639.60, 15,959.40 and 5,390.80 is: 8,086.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,639.60 : 15,959.40 = 5,390.80 : x
  2. Step 2: Convert to fraction form
    10,639.60/15,959.40 = 5,390.80/x
  3. Step 3: Cross multiply
    10,639.60x = 15,959.40 × 5,390.80
  4. Step 4: Simplify right side
    10,639.60x = 86,033,933.52
  5. Step 5: Solve for x
    x = 86,033,933.52/10,639.60
  6. Step 6: Final answer
    x = 8,086.20

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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.