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Finding the Fourth Proportional to 420.91, 631.43 and 146.92

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Solution

The fourth proportional to 420.91, 631.43 and 146.92 is: 220.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.91 : 631.43 = 146.92 : x
  2. Step 2: Convert to fraction form
    420.91/631.43 = 146.92/x
  3. Step 3: Cross multiply
    420.91x = 631.43 × 146.92
  4. Step 4: Simplify right side
    420.91x = 92,769.70
  5. Step 5: Solve for x
    x = 92,769.70/420.91
  6. Step 6: Final answer
    x = 220.40

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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.