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Finding the Fourth Proportional to 18,518.40, 27,734.40 and 18,147.20

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Solution

The fourth proportional to 18,518.40, 27,734.40 and 18,147.20 is: 27,178.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,518.40 : 27,734.40 = 18,147.20 : x
  2. Step 2: Convert to fraction form
    18,518.40/27,734.40 = 18,147.20/x
  3. Step 3: Cross multiply
    18,518.40x = 27,734.40 × 18,147.20
  4. Step 4: Simplify right side
    18,518.40x = 503,301,703.68
  5. Step 5: Solve for x
    x = 503,301,703.68/18,518.40
  6. Step 6: Final answer
    x = 27,178.47

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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.