Home / 15,153.78-20,912.16-8,439.49

Finding the Fourth Proportional to 15,153.78, 20,912.16 and 8,439.49

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Solution

The fourth proportional to 15,153.78, 20,912.16 and 8,439.49 is: 11,646.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,153.78 : 20,912.16 = 8,439.49 : x
  2. Step 2: Convert to fraction form
    15,153.78/20,912.16 = 8,439.49/x
  3. Step 3: Cross multiply
    15,153.78x = 20,912.16 × 8,439.49
  4. Step 4: Simplify right side
    15,153.78x = 176,487,965.20
  5. Step 5: Solve for x
    x = 176,487,965.20/15,153.78
  6. Step 6: Final answer
    x = 11,646.46

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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.