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Finding the Fourth Proportional to 85.97, 129.15 and 49.93

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Solution

The fourth proportional to 85.97, 129.15 and 49.93 is: 75.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.97 : 129.15 = 49.93 : x
  2. Step 2: Convert to fraction form
    85.97/129.15 = 49.93/x
  3. Step 3: Cross multiply
    85.97x = 129.15 × 49.93
  4. Step 4: Simplify right side
    85.97x = 6,448.14
  5. Step 5: Solve for x
    x = 6,448.14/85.97
  6. Step 6: Final answer
    x = 75.00

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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.