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Finding the Fourth Proportional to 631.85, 947.55 and 220.87

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Solution

The fourth proportional to 631.85, 947.55 and 220.87 is: 331.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.85 : 947.55 = 220.87 : x
  2. Step 2: Convert to fraction form
    631.85/947.55 = 220.87/x
  3. Step 3: Cross multiply
    631.85x = 947.55 × 220.87
  4. Step 4: Simplify right side
    631.85x = 209,284.26
  5. Step 5: Solve for x
    x = 209,284.26/631.85
  6. Step 6: Final answer
    x = 331.22

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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.