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Finding the Fourth Proportional to 210.74, 314.38 and 191.30

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Solution

The fourth proportional to 210.74, 314.38 and 191.30 is: 285.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.74 : 314.38 = 191.30 : x
  2. Step 2: Convert to fraction form
    210.74/314.38 = 191.30/x
  3. Step 3: Cross multiply
    210.74x = 314.38 × 191.30
  4. Step 4: Simplify right side
    210.74x = 60,139.94
  5. Step 5: Solve for x
    x = 60,139.94/210.74
  6. Step 6: Final answer
    x = 285.38

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.