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Finding the Fourth Proportional to 90.36, 124.80 and 70.92

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Solution

The fourth proportional to 90.36, 124.80 and 70.92 is: 97.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.36 : 124.80 = 70.92 : x
  2. Step 2: Convert to fraction form
    90.36/124.80 = 70.92/x
  3. Step 3: Cross multiply
    90.36x = 124.80 × 70.92
  4. Step 4: Simplify right side
    90.36x = 8,850.82
  5. Step 5: Solve for x
    x = 8,850.82/90.36
  6. Step 6: Final answer
    x = 97.95

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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.