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Finding the Fourth Proportional to 88.10, 131.08 and 87.78

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Solution

The fourth proportional to 88.10, 131.08 and 87.78 is: 130.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.10 : 131.08 = 87.78 : x
  2. Step 2: Convert to fraction form
    88.10/131.08 = 87.78/x
  3. Step 3: Cross multiply
    88.10x = 131.08 × 87.78
  4. Step 4: Simplify right side
    88.10x = 11,506.20
  5. Step 5: Solve for x
    x = 11,506.20/88.10
  6. Step 6: Final answer
    x = 130.60

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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.