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Finding the Fourth Proportional to 212.48, 318.88 and 90.84

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Solution

The fourth proportional to 212.48, 318.88 and 90.84 is: 136.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.48 : 318.88 = 90.84 : x
  2. Step 2: Convert to fraction form
    212.48/318.88 = 90.84/x
  3. Step 3: Cross multiply
    212.48x = 318.88 × 90.84
  4. Step 4: Simplify right side
    212.48x = 28,967.06
  5. Step 5: Solve for x
    x = 28,967.06/212.48
  6. Step 6: Final answer
    x = 136.33

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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.