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Finding the Fourth Proportional to 82.40, 113.65 and 49.63

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Solution

The fourth proportional to 82.40, 113.65 and 49.63 is: 68.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.40 : 113.65 = 49.63 : x
  2. Step 2: Convert to fraction form
    82.40/113.65 = 49.63/x
  3. Step 3: Cross multiply
    82.40x = 113.65 × 49.63
  4. Step 4: Simplify right side
    82.40x = 5,640.45
  5. Step 5: Solve for x
    x = 5,640.45/82.40
  6. Step 6: Final answer
    x = 68.45

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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.