Home / 128,991.48-193,542.66-66,705.72

Finding the Fourth Proportional to 128,991.48, 193,542.66 and 66,705.72

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Solution

The fourth proportional to 128,991.48, 193,542.66 and 66,705.72 is: 100,087.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,991.48 : 193,542.66 = 66,705.72 : x
  2. Step 2: Convert to fraction form
    128,991.48/193,542.66 = 66,705.72/x
  3. Step 3: Cross multiply
    128,991.48x = 193,542.66 × 66,705.72
  4. Step 4: Simplify right side
    128,991.48x = 12,910,402,486.02
  5. Step 5: Solve for x
    x = 12,910,402,486.02/128,991.48
  6. Step 6: Final answer
    x = 100,087.25

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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.