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Finding the Fourth Proportional to 68.55, 102.87 and 30.04

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Solution

The fourth proportional to 68.55, 102.87 and 30.04 is: 45.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.55 : 102.87 = 30.04 : x
  2. Step 2: Convert to fraction form
    68.55/102.87 = 30.04/x
  3. Step 3: Cross multiply
    68.55x = 102.87 × 30.04
  4. Step 4: Simplify right side
    68.55x = 3,090.21
  5. Step 5: Solve for x
    x = 3,090.21/68.55
  6. Step 6: Final answer
    x = 45.08

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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.