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Finding the Fourth Proportional to 15,121.01, 20,865.80 and 8,406.22

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Solution

The fourth proportional to 15,121.01, 20,865.80 and 8,406.22 is: 11,599.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,121.01 : 20,865.80 = 8,406.22 : x
  2. Step 2: Convert to fraction form
    15,121.01/20,865.80 = 8,406.22/x
  3. Step 3: Cross multiply
    15,121.01x = 20,865.80 × 8,406.22
  4. Step 4: Simplify right side
    15,121.01x = 175,402,505.28
  5. Step 5: Solve for x
    x = 175,402,505.28/15,121.01
  6. Step 6: Final answer
    x = 11,599.92

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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.