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Finding the Fourth Proportional to 283.45, 425.20 and 78.02

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Solution

The fourth proportional to 283.45, 425.20 and 78.02 is: 117.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.45 : 425.20 = 78.02 : x
  2. Step 2: Convert to fraction form
    283.45/425.20 = 78.02/x
  3. Step 3: Cross multiply
    283.45x = 425.20 × 78.02
  4. Step 4: Simplify right side
    283.45x = 33,171.78
  5. Step 5: Solve for x
    x = 33,171.78/283.45
  6. Step 6: Final answer
    x = 117.03

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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.