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Finding the Fourth Proportional to 85,993.40, 128,837.33 and 73,385.48

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Solution

The fourth proportional to 85,993.40, 128,837.33 and 73,385.48 is: 109,947.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,993.40 : 128,837.33 = 73,385.48 : x
  2. Step 2: Convert to fraction form
    85,993.40/128,837.33 = 73,385.48/x
  3. Step 3: Cross multiply
    85,993.40x = 128,837.33 × 73,385.48
  4. Step 4: Simplify right side
    85,993.40x = 9,454,788,292.85
  5. Step 5: Solve for x
    x = 9,454,788,292.85/85,993.40
  6. Step 6: Final answer
    x = 109,947.84

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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.