Home / 13,221.76-18,245.28-7,915.36

Finding the Fourth Proportional to 13,221.76, 18,245.28 and 7,915.36

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Solution

The fourth proportional to 13,221.76, 18,245.28 and 7,915.36 is: 10,922.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,221.76 : 18,245.28 = 7,915.36 : x
  2. Step 2: Convert to fraction form
    13,221.76/18,245.28 = 7,915.36/x
  3. Step 3: Cross multiply
    13,221.76x = 18,245.28 × 7,915.36
  4. Step 4: Simplify right side
    13,221.76x = 144,417,959.50
  5. Step 5: Solve for x
    x = 144,417,959.50/13,221.76
  6. Step 6: Final answer
    x = 10,922.75

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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.