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Finding the Fourth Proportional to 421.74, 581.95 and 235.20

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Solution

The fourth proportional to 421.74, 581.95 and 235.20 is: 324.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.74 : 581.95 = 235.20 : x
  2. Step 2: Convert to fraction form
    421.74/581.95 = 235.20/x
  3. Step 3: Cross multiply
    421.74x = 581.95 × 235.20
  4. Step 4: Simplify right side
    421.74x = 136,877.12
  5. Step 5: Solve for x
    x = 136,877.12/421.74
  6. Step 6: Final answer
    x = 324.55

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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.