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Finding the Fourth Proportional to 52,679.20, 78,826.80 and 38,855.20

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Solution

The fourth proportional to 52,679.20, 78,826.80 and 38,855.20 is: 58,141.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    52,679.20 : 78,826.80 = 38,855.20 : x
  2. Step 2: Convert to fraction form
    52,679.20/78,826.80 = 38,855.20/x
  3. Step 3: Cross multiply
    52,679.20x = 78,826.80 × 38,855.20
  4. Step 4: Simplify right side
    52,679.20x = 3,062,831,079.36
  5. Step 5: Solve for x
    x = 3,062,831,079.36/52,679.20
  6. Step 6: Final answer
    x = 58,141.18

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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.