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Finding the Fourth Proportional to 211.68, 318.87 and 210.60

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Solution

The fourth proportional to 211.68, 318.87 and 210.60 is: 317.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.68 : 318.87 = 210.60 : x
  2. Step 2: Convert to fraction form
    211.68/318.87 = 210.60/x
  3. Step 3: Cross multiply
    211.68x = 318.87 × 210.60
  4. Step 4: Simplify right side
    211.68x = 67,154.02
  5. Step 5: Solve for x
    x = 67,154.02/211.68
  6. Step 6: Final answer
    x = 317.24

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.