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Finding the Fourth Proportional to 18,689.77, 27,978.66 and 18,025.15

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Solution

The fourth proportional to 18,689.77, 27,978.66 and 18,025.15 is: 26,983.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,689.77 : 27,978.66 = 18,025.15 : x
  2. Step 2: Convert to fraction form
    18,689.77/27,978.66 = 18,025.15/x
  3. Step 3: Cross multiply
    18,689.77x = 27,978.66 × 18,025.15
  4. Step 4: Simplify right side
    18,689.77x = 504,319,543.30
  5. Step 5: Solve for x
    x = 504,319,543.30/18,689.77
  6. Step 6: Final answer
    x = 26,983.72

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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.