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Finding the Fourth Proportional to 75.88, 104.40 and 64.90

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Solution

The fourth proportional to 75.88, 104.40 and 64.90 is: 89.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.88 : 104.40 = 64.90 : x
  2. Step 2: Convert to fraction form
    75.88/104.40 = 64.90/x
  3. Step 3: Cross multiply
    75.88x = 104.40 × 64.90
  4. Step 4: Simplify right side
    75.88x = 6,775.56
  5. Step 5: Solve for x
    x = 6,775.56/75.88
  6. Step 6: Final answer
    x = 89.29

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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.