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Finding the Fourth Proportional to 142.88, 214.18 and 51.55

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Solution

The fourth proportional to 142.88, 214.18 and 51.55 is: 77.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.88 : 214.18 = 51.55 : x
  2. Step 2: Convert to fraction form
    142.88/214.18 = 51.55/x
  3. Step 3: Cross multiply
    142.88x = 214.18 × 51.55
  4. Step 4: Simplify right side
    142.88x = 11,041.39
  5. Step 5: Solve for x
    x = 11,041.39/142.88
  6. Step 6: Final answer
    x = 77.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.