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Finding the Fourth Proportional to 421.23, 581.36 and 281.30

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Solution

The fourth proportional to 421.23, 581.36 and 281.30 is: 388.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.23 : 581.36 = 281.30 : x
  2. Step 2: Convert to fraction form
    421.23/581.36 = 281.30/x
  3. Step 3: Cross multiply
    421.23x = 581.36 × 281.30
  4. Step 4: Simplify right side
    421.23x = 163,536.57
  5. Step 5: Solve for x
    x = 163,536.57/421.23
  6. Step 6: Final answer
    x = 388.24

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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.