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Finding the Fourth Proportional to 71.99, 99.74 and 70.31

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Solution

The fourth proportional to 71.99, 99.74 and 70.31 is: 97.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.99 : 99.74 = 70.31 : x
  2. Step 2: Convert to fraction form
    71.99/99.74 = 70.31/x
  3. Step 3: Cross multiply
    71.99x = 99.74 × 70.31
  4. Step 4: Simplify right side
    71.99x = 7,012.72
  5. Step 5: Solve for x
    x = 7,012.72/71.99
  6. Step 6: Final answer
    x = 97.41

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These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.