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Finding the Fourth Proportional to 75.79, 113.66 and 30.15

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Solution

The fourth proportional to 75.79, 113.66 and 30.15 is: 45.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.79 : 113.66 = 30.15 : x
  2. Step 2: Convert to fraction form
    75.79/113.66 = 30.15/x
  3. Step 3: Cross multiply
    75.79x = 113.66 × 30.15
  4. Step 4: Simplify right side
    75.79x = 3,426.36
  5. Step 5: Solve for x
    x = 3,426.36/75.79
  6. Step 6: Final answer
    x = 45.21

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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.