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Finding the Fourth Proportional to 78,261.20, 109,721.20 and 78,261.20

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Solution

The fourth proportional to 78,261.20, 109,721.20 and 78,261.20 is: 109,721.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,261.20 : 109,721.20 = 78,261.20 : x
  2. Step 2: Convert to fraction form
    78,261.20/109,721.20 = 78,261.20/x
  3. Step 3: Cross multiply
    78,261.20x = 109,721.20 × 78,261.20
  4. Step 4: Simplify right side
    78,261.20x = 8,586,912,777.44
  5. Step 5: Solve for x
    x = 8,586,912,777.44/78,261.20
  6. Step 6: Final answer
    x = 109,721.20

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.