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Finding the Fourth Proportional to 87.85, 121.21 and 51.01

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Solution

The fourth proportional to 87.85, 121.21 and 51.01 is: 70.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.85 : 121.21 = 51.01 : x
  2. Step 2: Convert to fraction form
    87.85/121.21 = 51.01/x
  3. Step 3: Cross multiply
    87.85x = 121.21 × 51.01
  4. Step 4: Simplify right side
    87.85x = 6,182.49
  5. Step 5: Solve for x
    x = 6,182.49/87.85
  6. Step 6: Final answer
    x = 70.38

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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.