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Finding the Fourth Proportional to 78,261.70, 109,721.90 and 78,261.70

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Solution

The fourth proportional to 78,261.70, 109,721.90 and 78,261.70 is: 109,721.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,261.70 : 109,721.90 = 78,261.70 : x
  2. Step 2: Convert to fraction form
    78,261.70/109,721.90 = 78,261.70/x
  3. Step 3: Cross multiply
    78,261.70x = 109,721.90 × 78,261.70
  4. Step 4: Simplify right side
    78,261.70x = 8,587,022,421.23
  5. Step 5: Solve for x
    x = 8,587,022,421.23/78,261.70
  6. Step 6: Final answer
    x = 109,721.90

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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.