Home / 12,912.16-17,820.40-7,247.20

Finding the Fourth Proportional to 12,912.16, 17,820.40 and 7,247.20

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Solution

The fourth proportional to 12,912.16, 17,820.40 and 7,247.20 is: 10,002.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,912.16 : 17,820.40 = 7,247.20 : x
  2. Step 2: Convert to fraction form
    12,912.16/17,820.40 = 7,247.20/x
  3. Step 3: Cross multiply
    12,912.16x = 17,820.40 × 7,247.20
  4. Step 4: Simplify right side
    12,912.16x = 129,148,002.88
  5. Step 5: Solve for x
    x = 129,148,002.88/12,912.16
  6. Step 6: Final answer
    x = 10,002.04

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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.