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Finding the Fourth Proportional to 94.81, 130.84 and 56

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Solution

The fourth proportional to 94.81, 130.84 and 56 is: 77.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.81 : 130.84 = 56 : x
  2. Step 2: Convert to fraction form
    94.81/130.84 = 56/x
  3. Step 3: Cross multiply
    94.81x = 130.84 × 56
  4. Step 4: Simplify right side
    94.81x = 7,327.04
  5. Step 5: Solve for x
    x = 7,327.04/94.81
  6. Step 6: Final answer
    x = 77.28

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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.