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Finding the Fourth Proportional to 211.47, 317.20 and 89.76

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Solution

The fourth proportional to 211.47, 317.20 and 89.76 is: 134.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.47 : 317.20 = 89.76 : x
  2. Step 2: Convert to fraction form
    211.47/317.20 = 89.76/x
  3. Step 3: Cross multiply
    211.47x = 317.20 × 89.76
  4. Step 4: Simplify right side
    211.47x = 28,471.87
  5. Step 5: Solve for x
    x = 28,471.87/211.47
  6. Step 6: Final answer
    x = 134.64

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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.