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Finding the Fourth Proportional to 210.66, 315.64 and 186.15

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Solution

The fourth proportional to 210.66, 315.64 and 186.15 is: 278.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.66 : 315.64 = 186.15 : x
  2. Step 2: Convert to fraction form
    210.66/315.64 = 186.15/x
  3. Step 3: Cross multiply
    210.66x = 315.64 × 186.15
  4. Step 4: Simplify right side
    210.66x = 58,756.39
  5. Step 5: Solve for x
    x = 58,756.39/210.66
  6. Step 6: Final answer
    x = 278.92

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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.