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Finding the Fourth Proportional to 222.80, 307.56 and 156.76

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Solution

The fourth proportional to 222.80, 307.56 and 156.76 is: 216.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.80 : 307.56 = 156.76 : x
  2. Step 2: Convert to fraction form
    222.80/307.56 = 156.76/x
  3. Step 3: Cross multiply
    222.80x = 307.56 × 156.76
  4. Step 4: Simplify right side
    222.80x = 48,213.11
  5. Step 5: Solve for x
    x = 48,213.11/222.80
  6. Step 6: Final answer
    x = 216.40

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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.