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Finding the Fourth Proportional to 283.64, 424.92 and 139.40

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Solution

The fourth proportional to 283.64, 424.92 and 139.40 is: 208.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.64 : 424.92 = 139.40 : x
  2. Step 2: Convert to fraction form
    283.64/424.92 = 139.40/x
  3. Step 3: Cross multiply
    283.64x = 424.92 × 139.40
  4. Step 4: Simplify right side
    283.64x = 59,233.85
  5. Step 5: Solve for x
    x = 59,233.85/283.64
  6. Step 6: Final answer
    x = 208.83

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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.