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Finding the Fourth Proportional to 310.64, 465.84 and 91.21

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Solution

The fourth proportional to 310.64, 465.84 and 91.21 is: 136.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.64 : 465.84 = 91.21 : x
  2. Step 2: Convert to fraction form
    310.64/465.84 = 91.21/x
  3. Step 3: Cross multiply
    310.64x = 465.84 × 91.21
  4. Step 4: Simplify right side
    310.64x = 42,488.10
  5. Step 5: Solve for x
    x = 42,488.10/310.64
  6. Step 6: Final answer
    x = 136.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.