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Finding the Fourth Proportional to 421.88, 581.76 and 281.92

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Solution

The fourth proportional to 421.88, 581.76 and 281.92 is: 388.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.88 : 581.76 = 281.92 : x
  2. Step 2: Convert to fraction form
    421.88/581.76 = 281.92/x
  3. Step 3: Cross multiply
    421.88x = 581.76 × 281.92
  4. Step 4: Simplify right side
    421.88x = 164,009.78
  5. Step 5: Solve for x
    x = 164,009.78/421.88
  6. Step 6: Final answer
    x = 388.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.