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Finding the Fourth Proportional to 90,765.74, 136,130.61 and 86,264.94

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Solution

The fourth proportional to 90,765.74, 136,130.61 and 86,264.94 is: 129,380.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,765.74 : 136,130.61 = 86,264.94 : x
  2. Step 2: Convert to fraction form
    90,765.74/136,130.61 = 86,264.94/x
  3. Step 3: Cross multiply
    90,765.74x = 136,130.61 × 86,264.94
  4. Step 4: Simplify right side
    90,765.74x = 11,743,298,716.82
  5. Step 5: Solve for x
    x = 11,743,298,716.82/90,765.74
  6. Step 6: Final answer
    x = 129,380.31

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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.