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Finding the Fourth Proportional to 283.76, 425.72 and 121.40

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Solution

The fourth proportional to 283.76, 425.72 and 121.40 is: 182.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.76 : 425.72 = 121.40 : x
  2. Step 2: Convert to fraction form
    283.76/425.72 = 121.40/x
  3. Step 3: Cross multiply
    283.76x = 425.72 × 121.40
  4. Step 4: Simplify right side
    283.76x = 51,682.41
  5. Step 5: Solve for x
    x = 51,682.41/283.76
  6. Step 6: Final answer
    x = 182.13

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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.