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Finding the Fourth Proportional to 75.51, 103.59 and 70.85

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Solution

The fourth proportional to 75.51, 103.59 and 70.85 is: 97.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.51 : 103.59 = 70.85 : x
  2. Step 2: Convert to fraction form
    75.51/103.59 = 70.85/x
  3. Step 3: Cross multiply
    75.51x = 103.59 × 70.85
  4. Step 4: Simplify right side
    75.51x = 7,339.35
  5. Step 5: Solve for x
    x = 7,339.35/75.51
  6. Step 6: Final answer
    x = 97.20

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.