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Finding the Fourth Proportional to 90.69, 125.12 and 63.07

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Solution

The fourth proportional to 90.69, 125.12 and 63.07 is: 87.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.69 : 125.12 = 63.07 : x
  2. Step 2: Convert to fraction form
    90.69/125.12 = 63.07/x
  3. Step 3: Cross multiply
    90.69x = 125.12 × 63.07
  4. Step 4: Simplify right side
    90.69x = 7,891.16
  5. Step 5: Solve for x
    x = 7,891.16/90.69
  6. Step 6: Final answer
    x = 87.01

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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.