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Finding the Fourth Proportional to 142.90, 214.21 and 51.58

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Solution

The fourth proportional to 142.90, 214.21 and 51.58 is: 77.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.90 : 214.21 = 51.58 : x
  2. Step 2: Convert to fraction form
    142.90/214.21 = 51.58/x
  3. Step 3: Cross multiply
    142.90x = 214.21 × 51.58
  4. Step 4: Simplify right side
    142.90x = 11,048.95
  5. Step 5: Solve for x
    x = 11,048.95/142.90
  6. Step 6: Final answer
    x = 77.32

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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.