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Finding the Fourth Proportional to 72,878.25, 109,317.39 and 20,289.12

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Solution

The fourth proportional to 72,878.25, 109,317.39 and 20,289.12 is: 30,433.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,878.25 : 109,317.39 = 20,289.12 : x
  2. Step 2: Convert to fraction form
    72,878.25/109,317.39 = 20,289.12/x
  3. Step 3: Cross multiply
    72,878.25x = 109,317.39 × 20,289.12
  4. Step 4: Simplify right side
    72,878.25x = 2,217,953,643.80
  5. Step 5: Solve for x
    x = 2,217,953,643.80/72,878.25
  6. Step 6: Final answer
    x = 30,433.68

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Double scale
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Similar ratio
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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.