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Finding the Fourth Proportional to 75.07, 103.38 and 61.16

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Solution

The fourth proportional to 75.07, 103.38 and 61.16 is: 84.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.07 : 103.38 = 61.16 : x
  2. Step 2: Convert to fraction form
    75.07/103.38 = 61.16/x
  3. Step 3: Cross multiply
    75.07x = 103.38 × 61.16
  4. Step 4: Simplify right side
    75.07x = 6,322.72
  5. Step 5: Solve for x
    x = 6,322.72/75.07
  6. Step 6: Final answer
    x = 84.22

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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.