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Finding the Fourth Proportional to 112,979.88, 155,912.31 and 62,678.88

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Solution

The fourth proportional to 112,979.88, 155,912.31 and 62,678.88 is: 86,496.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,979.88 : 155,912.31 = 62,678.88 : x
  2. Step 2: Convert to fraction form
    112,979.88/155,912.31 = 62,678.88/x
  3. Step 3: Cross multiply
    112,979.88x = 155,912.31 × 62,678.88
  4. Step 4: Simplify right side
    112,979.88x = 9,772,408,969.01
  5. Step 5: Solve for x
    x = 9,772,408,969.01/112,979.88
  6. Step 6: Final answer
    x = 86,496.90

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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.