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Finding the Fourth Proportional to 78,717.88, 108,631.81 and 42,907.89

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Solution

The fourth proportional to 78,717.88, 108,631.81 and 42,907.89 is: 59,213.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,717.88 : 108,631.81 = 42,907.89 : x
  2. Step 2: Convert to fraction form
    78,717.88/108,631.81 = 42,907.89/x
  3. Step 3: Cross multiply
    78,717.88x = 108,631.81 × 42,907.89
  4. Step 4: Simplify right side
    78,717.88x = 4,661,161,753.98
  5. Step 5: Solve for x
    x = 4,661,161,753.98/78,717.88
  6. Step 6: Final answer
    x = 59,213.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.