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Finding the Fourth Proportional to 131.58, 181.52 and 87.90

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Solution

The fourth proportional to 131.58, 181.52 and 87.90 is: 121.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.58 : 181.52 = 87.90 : x
  2. Step 2: Convert to fraction form
    131.58/181.52 = 87.90/x
  3. Step 3: Cross multiply
    131.58x = 181.52 × 87.90
  4. Step 4: Simplify right side
    131.58x = 15,955.61
  5. Step 5: Solve for x
    x = 15,955.61/131.58
  6. Step 6: Final answer
    x = 121.26

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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.