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Finding the Fourth Proportional to 440.78, 607.94 and 283.28

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Solution

The fourth proportional to 440.78, 607.94 and 283.28 is: 390.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.78 : 607.94 = 283.28 : x
  2. Step 2: Convert to fraction form
    440.78/607.94 = 283.28/x
  3. Step 3: Cross multiply
    440.78x = 607.94 × 283.28
  4. Step 4: Simplify right side
    440.78x = 172,217.24
  5. Step 5: Solve for x
    x = 172,217.24/440.78
  6. Step 6: Final answer
    x = 390.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.