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Finding the Fourth Proportional to 15,121.99, 20,868.23 and 8,407.56

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Solution

The fourth proportional to 15,121.99, 20,868.23 and 8,407.56 is: 11,602.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,121.99 : 20,868.23 = 8,407.56 : x
  2. Step 2: Convert to fraction form
    15,121.99/20,868.23 = 8,407.56/x
  3. Step 3: Cross multiply
    15,121.99x = 20,868.23 × 8,407.56
  4. Step 4: Simplify right side
    15,121.99x = 175,450,877.71
  5. Step 5: Solve for x
    x = 175,450,877.71/15,121.99
  6. Step 6: Final answer
    x = 11,602.37

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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.