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Finding the Fourth Proportional to 18,438.98, 27,678.51 and 17,112.20

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Solution

The fourth proportional to 18,438.98, 27,678.51 and 17,112.20 is: 25,686.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,438.98 : 27,678.51 = 17,112.20 : x
  2. Step 2: Convert to fraction form
    18,438.98/27,678.51 = 17,112.20/x
  3. Step 3: Cross multiply
    18,438.98x = 27,678.51 × 17,112.20
  4. Step 4: Simplify right side
    18,438.98x = 473,640,060.43
  5. Step 5: Solve for x
    x = 473,640,060.43/18,438.98
  6. Step 6: Final answer
    x = 25,686.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.