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Finding the Fourth Proportional to 245.53, 368.30 and 81

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Solution

The fourth proportional to 245.53, 368.30 and 81 is: 121.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.53 : 368.30 = 81 : x
  2. Step 2: Convert to fraction form
    245.53/368.30 = 81/x
  3. Step 3: Cross multiply
    245.53x = 368.30 × 81
  4. Step 4: Simplify right side
    245.53x = 29,832.30
  5. Step 5: Solve for x
    x = 29,832.30/245.53
  6. Step 6: Final answer
    x = 121.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.