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Finding the Fourth Proportional to 78,162.64, 117,242.90 and 18,998.12

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Solution

The fourth proportional to 78,162.64, 117,242.90 and 18,998.12 is: 28,496.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,162.64 : 117,242.90 = 18,998.12 : x
  2. Step 2: Convert to fraction form
    78,162.64/117,242.90 = 18,998.12/x
  3. Step 3: Cross multiply
    78,162.64x = 117,242.90 × 18,998.12
  4. Step 4: Simplify right side
    78,162.64x = 2,227,394,683.35
  5. Step 5: Solve for x
    x = 2,227,394,683.35/78,162.64
  6. Step 6: Final answer
    x = 28,496.92

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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.