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Finding the Fourth Proportional to 86,075.88, 128,248.68 and 81,241.44

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Solution

The fourth proportional to 86,075.88, 128,248.68 and 81,241.44 is: 121,045.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,075.88 : 128,248.68 = 81,241.44 : x
  2. Step 2: Convert to fraction form
    86,075.88/128,248.68 = 81,241.44/x
  3. Step 3: Cross multiply
    86,075.88x = 128,248.68 × 81,241.44
  4. Step 4: Simplify right side
    86,075.88x = 10,419,107,441.30
  5. Step 5: Solve for x
    x = 10,419,107,441.30/86,075.88
  6. Step 6: Final answer
    x = 121,045.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.