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Finding the Fourth Proportional to 421.67, 581.90 and 235.15

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Solution

The fourth proportional to 421.67, 581.90 and 235.15 is: 324.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.67 : 581.90 = 235.15 : x
  2. Step 2: Convert to fraction form
    421.67/581.90 = 235.15/x
  3. Step 3: Cross multiply
    421.67x = 581.90 × 235.15
  4. Step 4: Simplify right side
    421.67x = 136,831.15
  5. Step 5: Solve for x
    x = 136,831.15/421.67
  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.