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Finding the Fourth Proportional to 115,910.40, 173,640.01 and 85,460.07

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Solution

The fourth proportional to 115,910.40, 173,640.01 and 85,460.07 is: 128,023.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,910.40 : 173,640.01 = 85,460.07 : x
  2. Step 2: Convert to fraction form
    115,910.40/173,640.01 = 85,460.07/x
  3. Step 3: Cross multiply
    115,910.40x = 173,640.01 × 85,460.07
  4. Step 4: Simplify right side
    115,910.40x = 14,839,287,409.40
  5. Step 5: Solve for x
    x = 14,839,287,409.40/115,910.40
  6. Step 6: Final answer
    x = 128,023.78

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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.