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Finding the Fourth Proportional to 404.32, 606.72 and 212.08

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Solution

The fourth proportional to 404.32, 606.72 and 212.08 is: 318.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.32 : 606.72 = 212.08 : x
  2. Step 2: Convert to fraction form
    404.32/606.72 = 212.08/x
  3. Step 3: Cross multiply
    404.32x = 606.72 × 212.08
  4. Step 4: Simplify right side
    404.32x = 128,673.18
  5. Step 5: Solve for x
    x = 128,673.18/404.32
  6. Step 6: Final answer
    x = 318.25

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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.