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Finding the Fourth Proportional to 645.71, 968.95 and 399.24

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Solution

The fourth proportional to 645.71, 968.95 and 399.24 is: 599.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.71 : 968.95 = 399.24 : x
  2. Step 2: Convert to fraction form
    645.71/968.95 = 399.24/x
  3. Step 3: Cross multiply
    645.71x = 968.95 × 399.24
  4. Step 4: Simplify right side
    645.71x = 386,842.60
  5. Step 5: Solve for x
    x = 386,842.60/645.71
  6. Step 6: Final answer
    x = 599.10

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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.