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Finding the Fourth Proportional to 85.50, 127.67 and 79.02

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Solution

The fourth proportional to 85.50, 127.67 and 79.02 is: 117.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.50 : 127.67 = 79.02 : x
  2. Step 2: Convert to fraction form
    85.50/127.67 = 79.02/x
  3. Step 3: Cross multiply
    85.50x = 127.67 × 79.02
  4. Step 4: Simplify right side
    85.50x = 10,088.09
  5. Step 5: Solve for x
    x = 10,088.09/85.50
  6. Step 6: Final answer
    x = 117.99

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.