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Finding the Fourth Proportional to 211.95, 292.41 and 156.60

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Solution

The fourth proportional to 211.95, 292.41 and 156.60 is: 216.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.95 : 292.41 = 156.60 : x
  2. Step 2: Convert to fraction form
    211.95/292.41 = 156.60/x
  3. Step 3: Cross multiply
    211.95x = 292.41 × 156.60
  4. Step 4: Simplify right side
    211.95x = 45,791.41
  5. Step 5: Solve for x
    x = 45,791.41/211.95
  6. Step 6: Final answer
    x = 216.05

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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.