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Finding the Fourth Proportional to 211.68, 292.20 and 145.32

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Solution

The fourth proportional to 211.68, 292.20 and 145.32 is: 200.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.68 : 292.20 = 145.32 : x
  2. Step 2: Convert to fraction form
    211.68/292.20 = 145.32/x
  3. Step 3: Cross multiply
    211.68x = 292.20 × 145.32
  4. Step 4: Simplify right side
    211.68x = 42,462.50
  5. Step 5: Solve for x
    x = 42,462.50/211.68
  6. Step 6: Final answer
    x = 200.60

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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.