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Finding the Fourth Proportional to 68.15, 102.33 and 56.72

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Solution

The fourth proportional to 68.15, 102.33 and 56.72 is: 85.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.15 : 102.33 = 56.72 : x
  2. Step 2: Convert to fraction form
    68.15/102.33 = 56.72/x
  3. Step 3: Cross multiply
    68.15x = 102.33 × 56.72
  4. Step 4: Simplify right side
    68.15x = 5,803.65
  5. Step 5: Solve for x
    x = 5,803.65/68.15
  6. Step 6: Final answer
    x = 85.17

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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.