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Finding the Fourth Proportional to 220.32, 304.16 and 154.91

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Solution

The fourth proportional to 220.32, 304.16 and 154.91 is: 213.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.32 : 304.16 = 154.91 : x
  2. Step 2: Convert to fraction form
    220.32/304.16 = 154.91/x
  3. Step 3: Cross multiply
    220.32x = 304.16 × 154.91
  4. Step 4: Simplify right side
    220.32x = 47,117.41
  5. Step 5: Solve for x
    x = 47,117.41/220.32
  6. Step 6: Final answer
    x = 213.86

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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.