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Finding the Fourth Proportional to 211.79, 317.61 and 90.02

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Solution

The fourth proportional to 211.79, 317.61 and 90.02 is: 134.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.79 : 317.61 = 90.02 : x
  2. Step 2: Convert to fraction form
    211.79/317.61 = 90.02/x
  3. Step 3: Cross multiply
    211.79x = 317.61 × 90.02
  4. Step 4: Simplify right side
    211.79x = 28,589.21
  5. Step 5: Solve for x
    x = 28,589.21/211.79
  6. Step 6: Final answer
    x = 134.99

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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.