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Finding the Fourth Proportional to 18,655.65, 25,736.48 and 12,603.95

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Solution

The fourth proportional to 18,655.65, 25,736.48 and 12,603.95 is: 17,387.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,655.65 : 25,736.48 = 12,603.95 : x
  2. Step 2: Convert to fraction form
    18,655.65/25,736.48 = 12,603.95/x
  3. Step 3: Cross multiply
    18,655.65x = 25,736.48 × 12,603.95
  4. Step 4: Simplify right side
    18,655.65x = 324,381,274.26
  5. Step 5: Solve for x
    x = 324,381,274.26/18,655.65
  6. Step 6: Final answer
    x = 17,387.83

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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.