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Finding the Fourth Proportional to 259.92, 358.35 and 215.49

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Solution

The fourth proportional to 259.92, 358.35 and 215.49 is: 297.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.92 : 358.35 = 215.49 : x
  2. Step 2: Convert to fraction form
    259.92/358.35 = 215.49/x
  3. Step 3: Cross multiply
    259.92x = 358.35 × 215.49
  4. Step 4: Simplify right side
    259.92x = 77,220.66
  5. Step 5: Solve for x
    x = 77,220.66/259.92
  6. Step 6: Final answer
    x = 297.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.