Home / 15,549.94-21,445.71-13,139.11

Finding the Fourth Proportional to 15,549.94, 21,445.71 and 13,139.11

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Solution

The fourth proportional to 15,549.94, 21,445.71 and 13,139.11 is: 18,120.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,549.94 : 21,445.71 = 13,139.11 : x
  2. Step 2: Convert to fraction form
    15,549.94/21,445.71 = 13,139.11/x
  3. Step 3: Cross multiply
    15,549.94x = 21,445.71 × 13,139.11
  4. Step 4: Simplify right side
    15,549.94x = 281,777,520.25
  5. Step 5: Solve for x
    x = 281,777,520.25/15,549.94
  6. Step 6: Final answer
    x = 18,120.81

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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.