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Finding the Fourth Proportional to 219.31, 302.78 and 145.67

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Solution

The fourth proportional to 219.31, 302.78 and 145.67 is: 201.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.31 : 302.78 = 145.67 : x
  2. Step 2: Convert to fraction form
    219.31/302.78 = 145.67/x
  3. Step 3: Cross multiply
    219.31x = 302.78 × 145.67
  4. Step 4: Simplify right side
    219.31x = 44,104.81
  5. Step 5: Solve for x
    x = 44,104.81/219.31
  6. Step 6: Final answer
    x = 201.11

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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.