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Finding the Fourth Proportional to 105.26, 157.80 and 90.98

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Solution

The fourth proportional to 105.26, 157.80 and 90.98 is: 136.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.26 : 157.80 = 90.98 : x
  2. Step 2: Convert to fraction form
    105.26/157.80 = 90.98/x
  3. Step 3: Cross multiply
    105.26x = 157.80 × 90.98
  4. Step 4: Simplify right side
    105.26x = 14,356.64
  5. Step 5: Solve for x
    x = 14,356.64/105.26
  6. Step 6: Final answer
    x = 136.39

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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.