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Finding the Fourth Proportional to 71.68, 98.44 and 67.72

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Solution

The fourth proportional to 71.68, 98.44 and 67.72 is: 93.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.68 : 98.44 = 67.72 : x
  2. Step 2: Convert to fraction form
    71.68/98.44 = 67.72/x
  3. Step 3: Cross multiply
    71.68x = 98.44 × 67.72
  4. Step 4: Simplify right side
    71.68x = 6,666.36
  5. Step 5: Solve for x
    x = 6,666.36/71.68
  6. Step 6: Final answer
    x = 93.00

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.