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Finding the Fourth Proportional to 75.33, 103.90 and 53.51

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Solution

The fourth proportional to 75.33, 103.90 and 53.51 is: 73.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.33 : 103.90 = 53.51 : x
  2. Step 2: Convert to fraction form
    75.33/103.90 = 53.51/x
  3. Step 3: Cross multiply
    75.33x = 103.90 × 53.51
  4. Step 4: Simplify right side
    75.33x = 5,559.69
  5. Step 5: Solve for x
    x = 5,559.69/75.33
  6. Step 6: Final answer
    x = 73.80

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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.