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Finding the Fourth Proportional to 75.48, 104.16 and 57.08

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Solution

The fourth proportional to 75.48, 104.16 and 57.08 is: 78.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.48 : 104.16 = 57.08 : x
  2. Step 2: Convert to fraction form
    75.48/104.16 = 57.08/x
  3. Step 3: Cross multiply
    75.48x = 104.16 × 57.08
  4. Step 4: Simplify right side
    75.48x = 5,945.45
  5. Step 5: Solve for x
    x = 5,945.45/75.48
  6. Step 6: Final answer
    x = 78.77

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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.