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Finding the Fourth Proportional to 404.64, 607.20 and 212.28

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Solution

The fourth proportional to 404.64, 607.20 and 212.28 is: 318.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.64 : 607.20 = 212.28 : x
  2. Step 2: Convert to fraction form
    404.64/607.20 = 212.28/x
  3. Step 3: Cross multiply
    404.64x = 607.20 × 212.28
  4. Step 4: Simplify right side
    404.64x = 128,896.42
  5. Step 5: Solve for x
    x = 128,896.42/404.64
  6. Step 6: Final answer
    x = 318.55

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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.