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Finding the Fourth Proportional to 81,199.67, 112,075.85 and 65,003.72

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Solution

The fourth proportional to 81,199.67, 112,075.85 and 65,003.72 is: 89,721.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,199.67 : 112,075.85 = 65,003.72 : x
  2. Step 2: Convert to fraction form
    81,199.67/112,075.85 = 65,003.72/x
  3. Step 3: Cross multiply
    81,199.67x = 112,075.85 × 65,003.72
  4. Step 4: Simplify right side
    81,199.67x = 7,285,346,774.29
  5. Step 5: Solve for x
    x = 7,285,346,774.29/81,199.67
  6. Step 6: Final answer
    x = 89,721.39

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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.