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Finding the Fourth Proportional to 211.80, 292.32 and 156.60

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Solution

The fourth proportional to 211.80, 292.32 and 156.60 is: 216.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.80 : 292.32 = 156.60 : x
  2. Step 2: Convert to fraction form
    211.80/292.32 = 156.60/x
  3. Step 3: Cross multiply
    211.80x = 292.32 × 156.60
  4. Step 4: Simplify right side
    211.80x = 45,777.31
  5. Step 5: Solve for x
    x = 45,777.31/211.80
  6. Step 6: Final answer
    x = 216.13

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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.