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Finding the Fourth Proportional to 97.88, 135.07 and 90.15

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Solution

The fourth proportional to 97.88, 135.07 and 90.15 is: 124.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.88 : 135.07 = 90.15 : x
  2. Step 2: Convert to fraction form
    97.88/135.07 = 90.15/x
  3. Step 3: Cross multiply
    97.88x = 135.07 × 90.15
  4. Step 4: Simplify right side
    97.88x = 12,175.83
  5. Step 5: Solve for x
    x = 12,175.83/97.88
  6. Step 6: Final answer
    x = 124.40

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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.