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Finding the Fourth Proportional to 391.47, 587.21 and 283.47

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Solution

The fourth proportional to 391.47, 587.21 and 283.47 is: 425.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.47 : 587.21 = 283.47 : x
  2. Step 2: Convert to fraction form
    391.47/587.21 = 283.47/x
  3. Step 3: Cross multiply
    391.47x = 587.21 × 283.47
  4. Step 4: Simplify right side
    391.47x = 166,455.00
  5. Step 5: Solve for x
    x = 166,455.00/391.47
  6. Step 6: Final answer
    x = 425.21

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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.