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Finding the Fourth Proportional to 417.95, 626.71 and 212.21

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Solution

The fourth proportional to 417.95, 626.71 and 212.21 is: 318.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.95 : 626.71 = 212.21 : x
  2. Step 2: Convert to fraction form
    417.95/626.71 = 212.21/x
  3. Step 3: Cross multiply
    417.95x = 626.71 × 212.21
  4. Step 4: Simplify right side
    417.95x = 132,994.13
  5. Step 5: Solve for x
    x = 132,994.13/417.95
  6. Step 6: Final answer
    x = 318.21

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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.