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Finding the Fourth Proportional to 156,039.78, 215,364.03 and 88,971.78

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Solution

The fourth proportional to 156,039.78, 215,364.03 and 88,971.78 is: 122,797.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,039.78 : 215,364.03 = 88,971.78 : x
  2. Step 2: Convert to fraction form
    156,039.78/215,364.03 = 88,971.78/x
  3. Step 3: Cross multiply
    156,039.78x = 215,364.03 × 88,971.78
  4. Step 4: Simplify right side
    156,039.78x = 19,161,321,097.07
  5. Step 5: Solve for x
    x = 19,161,321,097.07/156,039.78
  6. Step 6: Final answer
    x = 122,797.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.