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Finding the Fourth Proportional to 78,218.70, 117,328.05 and 25,629.90

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Solution

The fourth proportional to 78,218.70, 117,328.05 and 25,629.90 is: 38,444.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,218.70 : 117,328.05 = 25,629.90 : x
  2. Step 2: Convert to fraction form
    78,218.70/117,328.05 = 25,629.90/x
  3. Step 3: Cross multiply
    78,218.70x = 117,328.05 × 25,629.90
  4. Step 4: Simplify right side
    78,218.70x = 3,007,106,188.70
  5. Step 5: Solve for x
    x = 3,007,106,188.70/78,218.70
  6. Step 6: Final answer
    x = 38,444.85

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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.