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Finding the Fourth Proportional to 90.60, 131.10 and 90.60

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Solution

The fourth proportional to 90.60, 131.10 and 90.60 is: 131.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.60 : 131.10 = 90.60 : x
  2. Step 2: Convert to fraction form
    90.60/131.10 = 90.60/x
  3. Step 3: Cross multiply
    90.60x = 131.10 × 90.60
  4. Step 4: Simplify right side
    90.60x = 11,877.66
  5. Step 5: Solve for x
    x = 11,877.66/90.60
  6. Step 6: Final answer
    x = 131.10

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.