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Finding the Fourth Proportional to 399.54, 598.95 and 156.21

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Solution

The fourth proportional to 399.54, 598.95 and 156.21 is: 234.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.54 : 598.95 = 156.21 : x
  2. Step 2: Convert to fraction form
    399.54/598.95 = 156.21/x
  3. Step 3: Cross multiply
    399.54x = 598.95 × 156.21
  4. Step 4: Simplify right side
    399.54x = 93,561.98
  5. Step 5: Solve for x
    x = 93,561.98/399.54
  6. Step 6: Final answer
    x = 234.17

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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.