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Finding the Fourth Proportional to 85,754.70, 128,634.75 and 26,590.82

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Solution

The fourth proportional to 85,754.70, 128,634.75 and 26,590.82 is: 39,887.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,754.70 : 128,634.75 = 26,590.82 : x
  2. Step 2: Convert to fraction form
    85,754.70/128,634.75 = 26,590.82/x
  3. Step 3: Cross multiply
    85,754.70x = 128,634.75 × 26,590.82
  4. Step 4: Simplify right side
    85,754.70x = 3,420,502,839.82
  5. Step 5: Solve for x
    x = 3,420,502,839.82/85,754.70
  6. Step 6: Final answer
    x = 39,887.06

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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.