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Finding the Fourth Proportional to 404.95, 607.00 and 212.71

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Solution

The fourth proportional to 404.95, 607.00 and 212.71 is: 318.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.95 : 607.00 = 212.71 : x
  2. Step 2: Convert to fraction form
    404.95/607.00 = 212.71/x
  3. Step 3: Cross multiply
    404.95x = 607.00 × 212.71
  4. Step 4: Simplify right side
    404.95x = 129,110.87
  5. Step 5: Solve for x
    x = 129,110.87/404.95
  6. Step 6: Final answer
    x = 318.84

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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.