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Finding the Fourth Proportional to 630.81, 946.34 and 219.91

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Solution

The fourth proportional to 630.81, 946.34 and 219.91 is: 329.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.81 : 946.34 = 219.91 : x
  2. Step 2: Convert to fraction form
    630.81/946.34 = 219.91/x
  3. Step 3: Cross multiply
    630.81x = 946.34 × 219.91
  4. Step 4: Simplify right side
    630.81x = 208,110.18
  5. Step 5: Solve for x
    x = 208,110.18/630.81
  6. Step 6: Final answer
    x = 329.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.