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Finding the Fourth Proportional to 75.40, 113.20 and 64.06

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Solution

The fourth proportional to 75.40, 113.20 and 64.06 is: 96.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.40 : 113.20 = 64.06 : x
  2. Step 2: Convert to fraction form
    75.40/113.20 = 64.06/x
  3. Step 3: Cross multiply
    75.40x = 113.20 × 64.06
  4. Step 4: Simplify right side
    75.40x = 7,251.15
  5. Step 5: Solve for x
    x = 7,251.15/75.40
  6. Step 6: Final answer
    x = 96.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.