Home / 13,608.93-18,780.30-7,640.55

Finding the Fourth Proportional to 13,608.93, 18,780.30 and 7,640.55

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Solution

The fourth proportional to 13,608.93, 18,780.30 and 7,640.55 is: 10,543.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,608.93 : 18,780.30 = 7,640.55 : x
  2. Step 2: Convert to fraction form
    13,608.93/18,780.30 = 7,640.55/x
  3. Step 3: Cross multiply
    13,608.93x = 18,780.30 × 7,640.55
  4. Step 4: Simplify right side
    13,608.93x = 143,491,821.17
  5. Step 5: Solve for x
    x = 143,491,821.17/13,608.93
  6. Step 6: Final answer
    x = 10,543.95

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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.