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Finding the Fourth Proportional to 239.19, 358.57 and 85.03

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Solution

The fourth proportional to 239.19, 358.57 and 85.03 is: 127.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.19 : 358.57 = 85.03 : x
  2. Step 2: Convert to fraction form
    239.19/358.57 = 85.03/x
  3. Step 3: Cross multiply
    239.19x = 358.57 × 85.03
  4. Step 4: Simplify right side
    239.19x = 30,489.21
  5. Step 5: Solve for x
    x = 30,489.21/239.19
  6. Step 6: Final answer
    x = 127.47

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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.