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Finding the Fourth Proportional to 219.36, 328.92 and 91

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Solution

The fourth proportional to 219.36, 328.92 and 91 is: 136.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.36 : 328.92 = 91 : x
  2. Step 2: Convert to fraction form
    219.36/328.92 = 91/x
  3. Step 3: Cross multiply
    219.36x = 328.92 × 91
  4. Step 4: Simplify right side
    219.36x = 29,931.72
  5. Step 5: Solve for x
    x = 29,931.72/219.36
  6. Step 6: Final answer
    x = 136.45

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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.