Home / 13,125.50-18,121.40-8,418

Finding the Fourth Proportional to 13,125.50, 18,121.40 and 8,418

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Solution

The fourth proportional to 13,125.50, 18,121.40 and 8,418 is: 11,622.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,125.50 : 18,121.40 = 8,418 : x
  2. Step 2: Convert to fraction form
    13,125.50/18,121.40 = 8,418/x
  3. Step 3: Cross multiply
    13,125.50x = 18,121.40 × 8,418
  4. Step 4: Simplify right side
    13,125.50x = 152,545,945.20
  5. Step 5: Solve for x
    x = 152,545,945.20/13,125.50
  6. Step 6: Final answer
    x = 11,622.11

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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.