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Finding the Fourth Proportional to 57.84, 79.89 and 50.45

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Solution

The fourth proportional to 57.84, 79.89 and 50.45 is: 69.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.84 : 79.89 = 50.45 : x
  2. Step 2: Convert to fraction form
    57.84/79.89 = 50.45/x
  3. Step 3: Cross multiply
    57.84x = 79.89 × 50.45
  4. Step 4: Simplify right side
    57.84x = 4,030.45
  5. Step 5: Solve for x
    x = 4,030.45/57.84
  6. Step 6: Final answer
    x = 69.68

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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.