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Finding the Fourth Proportional to 211.45, 317.23 and 89.65

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Solution

The fourth proportional to 211.45, 317.23 and 89.65 is: 134.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.45 : 317.23 = 89.65 : x
  2. Step 2: Convert to fraction form
    211.45/317.23 = 89.65/x
  3. Step 3: Cross multiply
    211.45x = 317.23 × 89.65
  4. Step 4: Simplify right side
    211.45x = 28,439.67
  5. Step 5: Solve for x
    x = 28,439.67/211.45
  6. Step 6: Final answer
    x = 134.50

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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.