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Finding the Fourth Proportional to 94.88, 130.85 and 87.90

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Solution

The fourth proportional to 94.88, 130.85 and 87.90 is: 121.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.88 : 130.85 = 87.90 : x
  2. Step 2: Convert to fraction form
    94.88/130.85 = 87.90/x
  3. Step 3: Cross multiply
    94.88x = 130.85 × 87.90
  4. Step 4: Simplify right side
    94.88x = 11,501.11
  5. Step 5: Solve for x
    x = 11,501.11/94.88
  6. Step 6: Final answer
    x = 121.21

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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.