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Finding the Fourth Proportional to 86.99, 120.02 and 54.23

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Solution

The fourth proportional to 86.99, 120.02 and 54.23 is: 74.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.99 : 120.02 = 54.23 : x
  2. Step 2: Convert to fraction form
    86.99/120.02 = 54.23/x
  3. Step 3: Cross multiply
    86.99x = 120.02 × 54.23
  4. Step 4: Simplify right side
    86.99x = 6,507.81
  5. Step 5: Solve for x
    x = 6,507.81/86.99
  6. Step 6: Final answer
    x = 74.82

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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.