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Finding the Fourth Proportional to 75.63, 112.89 and 64.09

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Solution

The fourth proportional to 75.63, 112.89 and 64.09 is: 95.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.63 : 112.89 = 64.09 : x
  2. Step 2: Convert to fraction form
    75.63/112.89 = 64.09/x
  3. Step 3: Cross multiply
    75.63x = 112.89 × 64.09
  4. Step 4: Simplify right side
    75.63x = 7,235.50
  5. Step 5: Solve for x
    x = 7,235.50/75.63
  6. Step 6: Final answer
    x = 95.67

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.