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Finding the Fourth Proportional to 18,661.11, 25,747.23 and 12,989.49

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Solution

The fourth proportional to 18,661.11, 25,747.23 and 12,989.49 is: 17,921.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,661.11 : 25,747.23 = 12,989.49 : x
  2. Step 2: Convert to fraction form
    18,661.11/25,747.23 = 12,989.49/x
  3. Step 3: Cross multiply
    18,661.11x = 25,747.23 × 12,989.49
  4. Step 4: Simplify right side
    18,661.11x = 334,443,386.61
  5. Step 5: Solve for x
    x = 334,443,386.61/18,661.11
  6. Step 6: Final answer
    x = 17,921.94

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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.