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Finding the Fourth Proportional to 421.70, 581.94 and 247.05

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Solution

The fourth proportional to 421.70, 581.94 and 247.05 is: 340.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.70 : 581.94 = 247.05 : x
  2. Step 2: Convert to fraction form
    421.70/581.94 = 247.05/x
  3. Step 3: Cross multiply
    421.70x = 581.94 × 247.05
  4. Step 4: Simplify right side
    421.70x = 143,768.28
  5. Step 5: Solve for x
    x = 143,768.28/421.70
  6. Step 6: Final answer
    x = 340.93

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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.