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Finding the Fourth Proportional to 221.98, 306.12 and 156.70

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Solution

The fourth proportional to 221.98, 306.12 and 156.70 is: 216.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.98 : 306.12 = 156.70 : x
  2. Step 2: Convert to fraction form
    221.98/306.12 = 156.70/x
  3. Step 3: Cross multiply
    221.98x = 306.12 × 156.70
  4. Step 4: Simplify right side
    221.98x = 47,969.00
  5. Step 5: Solve for x
    x = 47,969.00/221.98
  6. Step 6: Final answer
    x = 216.10

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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.