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Finding the Fourth Proportional to 212.85, 294.10 and 157.77

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Solution

The fourth proportional to 212.85, 294.10 and 157.77 is: 217.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.85 : 294.10 = 157.77 : x
  2. Step 2: Convert to fraction form
    212.85/294.10 = 157.77/x
  3. Step 3: Cross multiply
    212.85x = 294.10 × 157.77
  4. Step 4: Simplify right side
    212.85x = 46,399.76
  5. Step 5: Solve for x
    x = 46,399.76/212.85
  6. Step 6: Final answer
    x = 217.99

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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.