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Finding the Fourth Proportional to 75.79, 104.47 and 74.35

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Solution

The fourth proportional to 75.79, 104.47 and 74.35 is: 102.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.79 : 104.47 = 74.35 : x
  2. Step 2: Convert to fraction form
    75.79/104.47 = 74.35/x
  3. Step 3: Cross multiply
    75.79x = 104.47 × 74.35
  4. Step 4: Simplify right side
    75.79x = 7,767.34
  5. Step 5: Solve for x
    x = 7,767.34/75.79
  6. Step 6: Final answer
    x = 102.49

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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.