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Finding the Fourth Proportional to 13,121.99, 18,108 and 7,153.61

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Solution

The fourth proportional to 13,121.99, 18,108 and 7,153.61 is: 9,871.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,121.99 : 18,108 = 7,153.61 : x
  2. Step 2: Convert to fraction form
    13,121.99/18,108 = 7,153.61/x
  3. Step 3: Cross multiply
    13,121.99x = 18,108 × 7,153.61
  4. Step 4: Simplify right side
    13,121.99x = 129,537,479.34
  5. Step 5: Solve for x
    x = 129,537,479.34/13,121.99
  6. Step 6: Final answer
    x = 9,871.79

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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.