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Finding the Fourth Proportional to 85,974.95, 128,842.31 and 73,258.28

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Solution

The fourth proportional to 85,974.95, 128,842.31 and 73,258.28 is: 109,785.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,974.95 : 128,842.31 = 73,258.28 : x
  2. Step 2: Convert to fraction form
    85,974.95/128,842.31 = 73,258.28/x
  3. Step 3: Cross multiply
    85,974.95x = 128,842.31 × 73,258.28
  4. Step 4: Simplify right side
    85,974.95x = 9,438,766,356.58
  5. Step 5: Solve for x
    x = 9,438,766,356.58/85,974.95
  6. Step 6: Final answer
    x = 109,785.07

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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.