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Finding the Fourth Proportional to 630.45, 945.68 and 220.05

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Solution

The fourth proportional to 630.45, 945.68 and 220.05 is: 330.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.45 : 945.68 = 220.05 : x
  2. Step 2: Convert to fraction form
    630.45/945.68 = 220.05/x
  3. Step 3: Cross multiply
    630.45x = 945.68 × 220.05
  4. Step 4: Simplify right side
    630.45x = 208,095.78
  5. Step 5: Solve for x
    x = 208,095.78/630.45
  6. Step 6: Final answer
    x = 330.08

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Double scale
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Similar ratio
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1.5x scale

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.