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Finding the Fourth Proportional to 57.05, 78.45 and 48.84

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Solution

The fourth proportional to 57.05, 78.45 and 48.84 is: 67.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.05 : 78.45 = 48.84 : x
  2. Step 2: Convert to fraction form
    57.05/78.45 = 48.84/x
  3. Step 3: Cross multiply
    57.05x = 78.45 × 48.84
  4. Step 4: Simplify right side
    57.05x = 3,831.50
  5. Step 5: Solve for x
    x = 3,831.50/57.05
  6. Step 6: Final answer
    x = 67.17

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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.