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Finding the Fourth Proportional to 399.05, 598.58 and 155.58

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Solution

The fourth proportional to 399.05, 598.58 and 155.58 is: 233.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.05 : 598.58 = 155.58 : x
  2. Step 2: Convert to fraction form
    399.05/598.58 = 155.58/x
  3. Step 3: Cross multiply
    399.05x = 598.58 × 155.58
  4. Step 4: Simplify right side
    399.05x = 93,127.47
  5. Step 5: Solve for x
    x = 93,127.47/399.05
  6. Step 6: Final answer
    x = 233.37

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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.