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Finding the Fourth Proportional to 399.79, 599.70 and 156.28

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Solution

The fourth proportional to 399.79, 599.70 and 156.28 is: 234.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.79 : 599.70 = 156.28 : x
  2. Step 2: Convert to fraction form
    399.79/599.70 = 156.28/x
  3. Step 3: Cross multiply
    399.79x = 599.70 × 156.28
  4. Step 4: Simplify right side
    399.79x = 93,721.12
  5. Step 5: Solve for x
    x = 93,721.12/399.79
  6. Step 6: Final answer
    x = 234.43

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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.