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Finding the Fourth Proportional to 142.51, 213.82 and 84.77

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Solution

The fourth proportional to 142.51, 213.82 and 84.77 is: 127.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.51 : 213.82 = 84.77 : x
  2. Step 2: Convert to fraction form
    142.51/213.82 = 84.77/x
  3. Step 3: Cross multiply
    142.51x = 213.82 × 84.77
  4. Step 4: Simplify right side
    142.51x = 18,124.32
  5. Step 5: Solve for x
    x = 18,124.32/142.51
  6. Step 6: Final answer
    x = 127.18

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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.