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Finding the Fourth Proportional to 100.29, 139.35 and 98.99

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Solution

The fourth proportional to 100.29, 139.35 and 98.99 is: 137.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.29 : 139.35 = 98.99 : x
  2. Step 2: Convert to fraction form
    100.29/139.35 = 98.99/x
  3. Step 3: Cross multiply
    100.29x = 139.35 × 98.99
  4. Step 4: Simplify right side
    100.29x = 13,794.26
  5. Step 5: Solve for x
    x = 13,794.26/100.29
  6. Step 6: Final answer
    x = 137.54

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.