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Finding the Fourth Proportional to 211.68, 317.50 and 130.98

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Solution

The fourth proportional to 211.68, 317.50 and 130.98 is: 196.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.68 : 317.50 = 130.98 : x
  2. Step 2: Convert to fraction form
    211.68/317.50 = 130.98/x
  3. Step 3: Cross multiply
    211.68x = 317.50 × 130.98
  4. Step 4: Simplify right side
    211.68x = 41,586.15
  5. Step 5: Solve for x
    x = 41,586.15/211.68
  6. Step 6: Final answer
    x = 196.46

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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.