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Finding the Fourth Proportional to 421.55, 581.79 and 246.90

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Solution

The fourth proportional to 421.55, 581.79 and 246.90 is: 340.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.55 : 581.79 = 246.90 : x
  2. Step 2: Convert to fraction form
    421.55/581.79 = 246.90/x
  3. Step 3: Cross multiply
    421.55x = 581.79 × 246.90
  4. Step 4: Simplify right side
    421.55x = 143,643.95
  5. Step 5: Solve for x
    x = 143,643.95/421.55
  6. Step 6: Final answer
    x = 340.76

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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.