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Finding the Fourth Proportional to 310.42, 465.51 and 90.99

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Solution

The fourth proportional to 310.42, 465.51 and 90.99 is: 136.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.42 : 465.51 = 90.99 : x
  2. Step 2: Convert to fraction form
    310.42/465.51 = 90.99/x
  3. Step 3: Cross multiply
    310.42x = 465.51 × 90.99
  4. Step 4: Simplify right side
    310.42x = 42,355.99
  5. Step 5: Solve for x
    x = 42,355.99/310.42
  6. Step 6: Final answer
    x = 136.45

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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.