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Finding the Fourth Proportional to 85.99, 129.01 and 47.42

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Solution

The fourth proportional to 85.99, 129.01 and 47.42 is: 71.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.99 : 129.01 = 47.42 : x
  2. Step 2: Convert to fraction form
    85.99/129.01 = 47.42/x
  3. Step 3: Cross multiply
    85.99x = 129.01 × 47.42
  4. Step 4: Simplify right side
    85.99x = 6,116.77
  5. Step 5: Solve for x
    x = 6,116.77/85.99
  6. Step 6: Final answer
    x = 71.14

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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.