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Finding the Fourth Proportional to 239.61, 358.74 and 215.31

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Solution

The fourth proportional to 239.61, 358.74 and 215.31 is: 322.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.61 : 358.74 = 215.31 : x
  2. Step 2: Convert to fraction form
    239.61/358.74 = 215.31/x
  3. Step 3: Cross multiply
    239.61x = 358.74 × 215.31
  4. Step 4: Simplify right side
    239.61x = 77,240.31
  5. Step 5: Solve for x
    x = 77,240.31/239.61
  6. Step 6: Final answer
    x = 322.36

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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.