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Finding the Fourth Proportional to 219.70, 303.78 and 187.30

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Solution

The fourth proportional to 219.70, 303.78 and 187.30 is: 258.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.70 : 303.78 = 187.30 : x
  2. Step 2: Convert to fraction form
    219.70/303.78 = 187.30/x
  3. Step 3: Cross multiply
    219.70x = 303.78 × 187.30
  4. Step 4: Simplify right side
    219.70x = 56,897.99
  5. Step 5: Solve for x
    x = 56,897.99/219.70
  6. Step 6: Final answer
    x = 258.98

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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.