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Finding the Fourth Proportional to 78,929.20, 118,388.40 and 25,620.40

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Solution

The fourth proportional to 78,929.20, 118,388.40 and 25,620.40 is: 38,428.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,929.20 : 118,388.40 = 25,620.40 : x
  2. Step 2: Convert to fraction form
    78,929.20/118,388.40 = 25,620.40/x
  3. Step 3: Cross multiply
    78,929.20x = 118,388.40 × 25,620.40
  4. Step 4: Simplify right side
    78,929.20x = 3,033,158,163.36
  5. Step 5: Solve for x
    x = 3,033,158,163.36/78,929.20
  6. Step 6: Final answer
    x = 38,428.85

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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.