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Finding the Fourth Proportional to 399.56, 599.40 and 271.40

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Solution

The fourth proportional to 399.56, 599.40 and 271.40 is: 407.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.56 : 599.40 = 271.40 : x
  2. Step 2: Convert to fraction form
    399.56/599.40 = 271.40/x
  3. Step 3: Cross multiply
    399.56x = 599.40 × 271.40
  4. Step 4: Simplify right side
    399.56x = 162,677.16
  5. Step 5: Solve for x
    x = 162,677.16/399.56
  6. Step 6: Final answer
    x = 407.14

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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.