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Finding the Fourth Proportional to 421.40, 581.36 and 263.95

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Solution

The fourth proportional to 421.40, 581.36 and 263.95 is: 364.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.40 : 581.36 = 263.95 : x
  2. Step 2: Convert to fraction form
    421.40/581.36 = 263.95/x
  3. Step 3: Cross multiply
    421.40x = 581.36 × 263.95
  4. Step 4: Simplify right side
    421.40x = 153,449.97
  5. Step 5: Solve for x
    x = 153,449.97/421.40
  6. Step 6: Final answer
    x = 364.14

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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.