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Finding the Fourth Proportional to 630.05, 945.30 and 399.53

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Solution

The fourth proportional to 630.05, 945.30 and 399.53 is: 599.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.05 : 945.30 = 399.53 : x
  2. Step 2: Convert to fraction form
    630.05/945.30 = 399.53/x
  3. Step 3: Cross multiply
    630.05x = 945.30 × 399.53
  4. Step 4: Simplify right side
    630.05x = 377,679.57
  5. Step 5: Solve for x
    x = 377,679.57/630.05
  6. Step 6: Final answer
    x = 599.45

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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.