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Finding the Fourth Proportional to 212, 317.65 and 89.99

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Solution

The fourth proportional to 212, 317.65 and 89.99 is: 134.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    212 : 317.65 = 89.99 : x
  2. Step 2: Convert to fraction form
    212/317.65 = 89.99/x
  3. Step 3: Cross multiply
    212x = 317.65 × 89.99
  4. Step 4: Simplify right side
    212x = 28,585.32
  5. Step 5: Solve for x
    x = 28,585.32/212
  6. Step 6: Final answer
    x = 134.84

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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.