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Finding the Fourth Proportional to 211.23, 316.84 and 89.47

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Solution

The fourth proportional to 211.23, 316.84 and 89.47 is: 134.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.23 : 316.84 = 89.47 : x
  2. Step 2: Convert to fraction form
    211.23/316.84 = 89.47/x
  3. Step 3: Cross multiply
    211.23x = 316.84 × 89.47
  4. Step 4: Simplify right side
    211.23x = 28,347.23
  5. Step 5: Solve for x
    x = 28,347.23/211.23
  6. Step 6: Final answer
    x = 134.20

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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.