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Finding the Fourth Proportional to 220.59, 328.98 and 188.30

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Solution

The fourth proportional to 220.59, 328.98 and 188.30 is: 280.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.59 : 328.98 = 188.30 : x
  2. Step 2: Convert to fraction form
    220.59/328.98 = 188.30/x
  3. Step 3: Cross multiply
    220.59x = 328.98 × 188.30
  4. Step 4: Simplify right side
    220.59x = 61,945.29
  5. Step 5: Solve for x
    x = 61,945.29/220.59
  6. Step 6: Final answer
    x = 280.82

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.