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Finding the Fourth Proportional to 136,999.50, 205,560.81 and 87,066.66

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Solution

The fourth proportional to 136,999.50, 205,560.81 and 87,066.66 is: 130,639.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,999.50 : 205,560.81 = 87,066.66 : x
  2. Step 2: Convert to fraction form
    136,999.50/205,560.81 = 87,066.66/x
  3. Step 3: Cross multiply
    136,999.50x = 205,560.81 × 87,066.66
  4. Step 4: Simplify right side
    136,999.50x = 17,897,493,153.59
  5. Step 5: Solve for x
    x = 17,897,493,153.59/136,999.50
  6. Step 6: Final answer
    x = 130,639.11

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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.