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Finding the Fourth Proportional to 75.40, 113.10 and 57.18

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Solution

The fourth proportional to 75.40, 113.10 and 57.18 is: 85.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.40 : 113.10 = 57.18 : x
  2. Step 2: Convert to fraction form
    75.40/113.10 = 57.18/x
  3. Step 3: Cross multiply
    75.40x = 113.10 × 57.18
  4. Step 4: Simplify right side
    75.40x = 6,467.06
  5. Step 5: Solve for x
    x = 6,467.06/75.40
  6. Step 6: Final answer
    x = 85.77

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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.