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Finding the Fourth Proportional to 18,013.30, 26,987.55 and 15,421.30

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Solution

The fourth proportional to 18,013.30, 26,987.55 and 15,421.30 is: 23,104.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,013.30 : 26,987.55 = 15,421.30 : x
  2. Step 2: Convert to fraction form
    18,013.30/26,987.55 = 15,421.30/x
  3. Step 3: Cross multiply
    18,013.30x = 26,987.55 × 15,421.30
  4. Step 4: Simplify right side
    18,013.30x = 416,183,104.82
  5. Step 5: Solve for x
    x = 416,183,104.82/18,013.30
  6. Step 6: Final answer
    x = 23,104.21

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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.