Home / 10,212.80-15,315.60-3,639.20

Finding the Fourth Proportional to 10,212.80, 15,315.60 and 3,639.20

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Solution

The fourth proportional to 10,212.80, 15,315.60 and 3,639.20 is: 5,457.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,212.80 : 15,315.60 = 3,639.20 : x
  2. Step 2: Convert to fraction form
    10,212.80/15,315.60 = 3,639.20/x
  3. Step 3: Cross multiply
    10,212.80x = 15,315.60 × 3,639.20
  4. Step 4: Simplify right side
    10,212.80x = 55,736,531.52
  5. Step 5: Solve for x
    x = 55,736,531.52/10,212.80
  6. Step 6: Final answer
    x = 5,457.52

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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.