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Finding the Fourth Proportional to 91.00, 135.73 and 76.64

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Solution

The fourth proportional to 91.00, 135.73 and 76.64 is: 114.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.00 : 135.73 = 76.64 : x
  2. Step 2: Convert to fraction form
    91.00/135.73 = 76.64/x
  3. Step 3: Cross multiply
    91.00x = 135.73 × 76.64
  4. Step 4: Simplify right side
    91.00x = 10,402.35
  5. Step 5: Solve for x
    x = 10,402.35/91.00
  6. Step 6: Final answer
    x = 114.32

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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.