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Finding the Fourth Proportional to 75.70, 104.68 and 64.18

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Solution

The fourth proportional to 75.70, 104.68 and 64.18 is: 88.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.70 : 104.68 = 64.18 : x
  2. Step 2: Convert to fraction form
    75.70/104.68 = 64.18/x
  3. Step 3: Cross multiply
    75.70x = 104.68 × 64.18
  4. Step 4: Simplify right side
    75.70x = 6,718.36
  5. Step 5: Solve for x
    x = 6,718.36/75.70
  6. Step 6: Final answer
    x = 88.75

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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.