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Finding the Fourth Proportional to 90,739.60, 136,091.64 and 86,238.82

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Solution

The fourth proportional to 90,739.60, 136,091.64 and 86,238.82 is: 129,341.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,739.60 : 136,091.64 = 86,238.82 : x
  2. Step 2: Convert to fraction form
    90,739.60/136,091.64 = 86,238.82/x
  3. Step 3: Cross multiply
    90,739.60x = 136,091.64 × 86,238.82
  4. Step 4: Simplify right side
    90,739.60x = 11,736,382,445.46
  5. Step 5: Solve for x
    x = 11,736,382,445.46/90,739.60
  6. Step 6: Final answer
    x = 129,341.35

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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.