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Finding the Fourth Proportional to 85,974.80, 128,987.82 and 41,029.90

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Solution

The fourth proportional to 85,974.80, 128,987.82 and 41,029.90 is: 61,557.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,974.80 : 128,987.82 = 41,029.90 : x
  2. Step 2: Convert to fraction form
    85,974.80/128,987.82 = 41,029.90/x
  3. Step 3: Cross multiply
    85,974.80x = 128,987.82 × 41,029.90
  4. Step 4: Simplify right side
    85,974.80x = 5,292,357,355.82
  5. Step 5: Solve for x
    x = 5,292,357,355.82/85,974.80
  6. Step 6: Final answer
    x = 61,557.08

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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.