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Finding the Fourth Proportional to 131,969.36, 197,720.76 and 87,490.64

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Solution

The fourth proportional to 131,969.36, 197,720.76 and 87,490.64 is: 131,081.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,969.36 : 197,720.76 = 87,490.64 : x
  2. Step 2: Convert to fraction form
    131,969.36/197,720.76 = 87,490.64/x
  3. Step 3: Cross multiply
    131,969.36x = 197,720.76 × 87,490.64
  4. Step 4: Simplify right side
    131,969.36x = 17,298,715,833.69
  5. Step 5: Solve for x
    x = 17,298,715,833.69/131,969.36
  6. Step 6: Final answer
    x = 131,081.30

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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.