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Finding the Fourth Proportional to 219.60, 302.87 and 140.90

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Solution

The fourth proportional to 219.60, 302.87 and 140.90 is: 194.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.60 : 302.87 = 140.90 : x
  2. Step 2: Convert to fraction form
    219.60/302.87 = 140.90/x
  3. Step 3: Cross multiply
    219.60x = 302.87 × 140.90
  4. Step 4: Simplify right side
    219.60x = 42,673.22
  5. Step 5: Solve for x
    x = 42,673.22/219.60
  6. Step 6: Final answer
    x = 194.32

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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.