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Finding the Fourth Proportional to 84,878.73, 127,315.80 and 28,718.46

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Solution

The fourth proportional to 84,878.73, 127,315.80 and 28,718.46 is: 43,076.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,878.73 : 127,315.80 = 28,718.46 : x
  2. Step 2: Convert to fraction form
    84,878.73/127,315.80 = 28,718.46/x
  3. Step 3: Cross multiply
    84,878.73x = 127,315.80 × 28,718.46
  4. Step 4: Simplify right side
    84,878.73x = 3,656,313,709.67
  5. Step 5: Solve for x
    x = 3,656,313,709.67/84,878.73
  6. Step 6: Final answer
    x = 43,076.91

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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.