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Finding the Fourth Proportional to 274.57, 378.98 and 156.61

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Solution

The fourth proportional to 274.57, 378.98 and 156.61 is: 216.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.57 : 378.98 = 156.61 : x
  2. Step 2: Convert to fraction form
    274.57/378.98 = 156.61/x
  3. Step 3: Cross multiply
    274.57x = 378.98 × 156.61
  4. Step 4: Simplify right side
    274.57x = 59,352.34
  5. Step 5: Solve for x
    x = 59,352.34/274.57
  6. Step 6: Final answer
    x = 216.17

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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.