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Finding the Fourth Proportional to 631.25, 946.30 and 220.30

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Solution

The fourth proportional to 631.25, 946.30 and 220.30 is: 330.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.25 : 946.30 = 220.30 : x
  2. Step 2: Convert to fraction form
    631.25/946.30 = 220.30/x
  3. Step 3: Cross multiply
    631.25x = 946.30 × 220.30
  4. Step 4: Simplify right side
    631.25x = 208,468.79
  5. Step 5: Solve for x
    x = 208,468.79/631.25
  6. Step 6: Final answer
    x = 330.25

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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.