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Finding the Fourth Proportional to 421.54, 581.65 and 235.01

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Solution

The fourth proportional to 421.54, 581.65 and 235.01 is: 324.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.54 : 581.65 = 235.01 : x
  2. Step 2: Convert to fraction form
    421.54/581.65 = 235.01/x
  3. Step 3: Cross multiply
    421.54x = 581.65 × 235.01
  4. Step 4: Simplify right side
    421.54x = 136,694.43
  5. Step 5: Solve for x
    x = 136,694.43/421.54
  6. Step 6: Final answer
    x = 324.28

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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.