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Finding the Fourth Proportional to 339.68, 468.92 and 215.40

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Solution

The fourth proportional to 339.68, 468.92 and 215.40 is: 297.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.68 : 468.92 = 215.40 : x
  2. Step 2: Convert to fraction form
    339.68/468.92 = 215.40/x
  3. Step 3: Cross multiply
    339.68x = 468.92 × 215.40
  4. Step 4: Simplify right side
    339.68x = 101,005.37
  5. Step 5: Solve for x
    x = 101,005.37/339.68
  6. Step 6: Final answer
    x = 297.35

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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.