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Finding the Fourth Proportional to 75.66, 104.21 and 70.35

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Solution

The fourth proportional to 75.66, 104.21 and 70.35 is: 96.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.66 : 104.21 = 70.35 : x
  2. Step 2: Convert to fraction form
    75.66/104.21 = 70.35/x
  3. Step 3: Cross multiply
    75.66x = 104.21 × 70.35
  4. Step 4: Simplify right side
    75.66x = 7,331.17
  5. Step 5: Solve for x
    x = 7,331.17/75.66
  6. Step 6: Final answer
    x = 96.90

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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.