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Finding the Fourth Proportional to 75.30, 112.49 and 74.94

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Solution

The fourth proportional to 75.30, 112.49 and 74.94 is: 111.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.30 : 112.49 = 74.94 : x
  2. Step 2: Convert to fraction form
    75.30/112.49 = 74.94/x
  3. Step 3: Cross multiply
    75.30x = 112.49 × 74.94
  4. Step 4: Simplify right side
    75.30x = 8,430.00
  5. Step 5: Solve for x
    x = 8,430.00/75.30
  6. Step 6: Final answer
    x = 111.95

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.