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Finding the Fourth Proportional to 421.28, 581.36 and 234.77

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Solution

The fourth proportional to 421.28, 581.36 and 234.77 is: 323.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.28 : 581.36 = 234.77 : x
  2. Step 2: Convert to fraction form
    421.28/581.36 = 234.77/x
  3. Step 3: Cross multiply
    421.28x = 581.36 × 234.77
  4. Step 4: Simplify right side
    421.28x = 136,481.81
  5. Step 5: Solve for x
    x = 136,481.81/421.28
  6. Step 6: Final answer
    x = 323.97

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Find fourth proportional to 210.64, 290.68 and 117.38
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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.