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Finding the Fourth Proportional to 211.50, 316.89 and 89.70

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Solution

The fourth proportional to 211.50, 316.89 and 89.70 is: 134.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.50 : 316.89 = 89.70 : x
  2. Step 2: Convert to fraction form
    211.50/316.89 = 89.70/x
  3. Step 3: Cross multiply
    211.50x = 316.89 × 89.70
  4. Step 4: Simplify right side
    211.50x = 28,425.03
  5. Step 5: Solve for x
    x = 28,425.03/211.50
  6. Step 6: Final answer
    x = 134.40

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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.