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Finding the Fourth Proportional to 75.15, 103.63 and 64.82

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Solution

The fourth proportional to 75.15, 103.63 and 64.82 is: 89.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.15 : 103.63 = 64.82 : x
  2. Step 2: Convert to fraction form
    75.15/103.63 = 64.82/x
  3. Step 3: Cross multiply
    75.15x = 103.63 × 64.82
  4. Step 4: Simplify right side
    75.15x = 6,717.30
  5. Step 5: Solve for x
    x = 6,717.30/75.15
  6. Step 6: Final answer
    x = 89.39

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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.