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Finding the Fourth Proportional to 72.10, 108.12 and 45.05

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Solution

The fourth proportional to 72.10, 108.12 and 45.05 is: 67.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.10 : 108.12 = 45.05 : x
  2. Step 2: Convert to fraction form
    72.10/108.12 = 45.05/x
  3. Step 3: Cross multiply
    72.10x = 108.12 × 45.05
  4. Step 4: Simplify right side
    72.10x = 4,870.81
  5. Step 5: Solve for x
    x = 4,870.81/72.10
  6. Step 6: Final answer
    x = 67.56

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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.