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Finding the Fourth Proportional to 18,978.55, 26,188.24 and 11,019.18

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Solution

The fourth proportional to 18,978.55, 26,188.24 and 11,019.18 is: 15,205.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978.55 : 26,188.24 = 11,019.18 : x
  2. Step 2: Convert to fraction form
    18,978.55/26,188.24 = 11,019.18/x
  3. Step 3: Cross multiply
    18,978.55x = 26,188.24 × 11,019.18
  4. Step 4: Simplify right side
    18,978.55x = 288,572,930.44
  5. Step 5: Solve for x
    x = 288,572,930.44/18,978.55
  6. Step 6: Final answer
    x = 15,205.21

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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.