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Finding the Fourth Proportional to 421.68, 581.86 and 235.17

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Solution

The fourth proportional to 421.68, 581.86 and 235.17 is: 324.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.68 : 581.86 = 235.17 : x
  2. Step 2: Convert to fraction form
    421.68/581.86 = 235.17/x
  3. Step 3: Cross multiply
    421.68x = 581.86 × 235.17
  4. Step 4: Simplify right side
    421.68x = 136,836.02
  5. Step 5: Solve for x
    x = 136,836.02/421.68
  6. Step 6: Final answer
    x = 324.50

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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.