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Finding the Fourth Proportional to 310.58, 465.80 and 91.15

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Solution

The fourth proportional to 310.58, 465.80 and 91.15 is: 136.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.58 : 465.80 = 91.15 : x
  2. Step 2: Convert to fraction form
    310.58/465.80 = 91.15/x
  3. Step 3: Cross multiply
    310.58x = 465.80 × 91.15
  4. Step 4: Simplify right side
    310.58x = 42,457.67
  5. Step 5: Solve for x
    x = 42,457.67/310.58
  6. Step 6: Final answer
    x = 136.70

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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.