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Finding the Fourth Proportional to 219.06, 328.16 and 145.72

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Solution

The fourth proportional to 219.06, 328.16 and 145.72 is: 218.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.06 : 328.16 = 145.72 : x
  2. Step 2: Convert to fraction form
    219.06/328.16 = 145.72/x
  3. Step 3: Cross multiply
    219.06x = 328.16 × 145.72
  4. Step 4: Simplify right side
    219.06x = 47,817.99
  5. Step 5: Solve for x
    x = 47,817.99/219.06
  6. Step 6: Final answer
    x = 218.28

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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.