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Finding the Fourth Proportional to 88.21, 131.77 and 87.81

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Solution

The fourth proportional to 88.21, 131.77 and 87.81 is: 131.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.21 : 131.77 = 87.81 : x
  2. Step 2: Convert to fraction form
    88.21/131.77 = 87.81/x
  3. Step 3: Cross multiply
    88.21x = 131.77 × 87.81
  4. Step 4: Simplify right side
    88.21x = 11,570.72
  5. Step 5: Solve for x
    x = 11,570.72/88.21
  6. Step 6: Final answer
    x = 131.17

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.