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Finding the Fourth Proportional to 283.03, 424.47 and 128.79

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Solution

The fourth proportional to 283.03, 424.47 and 128.79 is: 193.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.03 : 424.47 = 128.79 : x
  2. Step 2: Convert to fraction form
    283.03/424.47 = 128.79/x
  3. Step 3: Cross multiply
    283.03x = 424.47 × 128.79
  4. Step 4: Simplify right side
    283.03x = 54,667.97
  5. Step 5: Solve for x
    x = 54,667.97/283.03
  6. Step 6: Final answer
    x = 193.15

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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.