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Finding the Fourth Proportional to 76.13, 105.07 and 45.03

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Solution

The fourth proportional to 76.13, 105.07 and 45.03 is: 62.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.13 : 105.07 = 45.03 : x
  2. Step 2: Convert to fraction form
    76.13/105.07 = 45.03/x
  3. Step 3: Cross multiply
    76.13x = 105.07 × 45.03
  4. Step 4: Simplify right side
    76.13x = 4,731.79
  5. Step 5: Solve for x
    x = 4,731.79/76.13
  6. Step 6: Final answer
    x = 62.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.