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Finding the Fourth Proportional to 74.99, 112.66 and 53.39

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Solution

The fourth proportional to 74.99, 112.66 and 53.39 is: 80.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.99 : 112.66 = 53.39 : x
  2. Step 2: Convert to fraction form
    74.99/112.66 = 53.39/x
  3. Step 3: Cross multiply
    74.99x = 112.66 × 53.39
  4. Step 4: Simplify right side
    74.99x = 6,015.07
  5. Step 5: Solve for x
    x = 6,015.07/74.99
  6. Step 6: Final answer
    x = 80.21

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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.