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Finding the Fourth Proportional to 399.16, 597.66 and 381.40

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Solution

The fourth proportional to 399.16, 597.66 and 381.40 is: 571.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.16 : 597.66 = 381.40 : x
  2. Step 2: Convert to fraction form
    399.16/597.66 = 381.40/x
  3. Step 3: Cross multiply
    399.16x = 597.66 × 381.40
  4. Step 4: Simplify right side
    399.16x = 227,947.52
  5. Step 5: Solve for x
    x = 227,947.52/399.16
  6. Step 6: Final answer
    x = 571.07

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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.