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Finding the Fourth Proportional to 15,121.14, 20,868.33 and 8,407.32

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Solution

The fourth proportional to 15,121.14, 20,868.33 and 8,407.32 is: 11,602.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,121.14 : 20,868.33 = 8,407.32 : x
  2. Step 2: Convert to fraction form
    15,121.14/20,868.33 = 8,407.32/x
  3. Step 3: Cross multiply
    15,121.14x = 20,868.33 × 8,407.32
  4. Step 4: Simplify right side
    15,121.14x = 175,446,728.18
  5. Step 5: Solve for x
    x = 175,446,728.18/15,121.14
  6. Step 6: Final answer
    x = 11,602.74

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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.