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Finding the Fourth Proportional to 211.47, 316.92 and 101.79

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Solution

The fourth proportional to 211.47, 316.92 and 101.79 is: 152.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.47 : 316.92 = 101.79 : x
  2. Step 2: Convert to fraction form
    211.47/316.92 = 101.79/x
  3. Step 3: Cross multiply
    211.47x = 316.92 × 101.79
  4. Step 4: Simplify right side
    211.47x = 32,259.29
  5. Step 5: Solve for x
    x = 32,259.29/211.47
  6. Step 6: Final answer
    x = 152.55

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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.