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Finding the Fourth Proportional to 131.39, 181.30 and 87.74

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Solution

The fourth proportional to 131.39, 181.30 and 87.74 is: 121.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.39 : 181.30 = 87.74 : x
  2. Step 2: Convert to fraction form
    131.39/181.30 = 87.74/x
  3. Step 3: Cross multiply
    131.39x = 181.30 × 87.74
  4. Step 4: Simplify right side
    131.39x = 15,907.26
  5. Step 5: Solve for x
    x = 15,907.26/131.39
  6. Step 6: Final answer
    x = 121.07

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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.