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Finding the Fourth Proportional to 89.83, 135.44 and 72.01

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Solution

The fourth proportional to 89.83, 135.44 and 72.01 is: 108.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.83 : 135.44 = 72.01 : x
  2. Step 2: Convert to fraction form
    89.83/135.44 = 72.01/x
  3. Step 3: Cross multiply
    89.83x = 135.44 × 72.01
  4. Step 4: Simplify right side
    89.83x = 9,752.67
  5. Step 5: Solve for x
    x = 9,752.67/89.83
  6. Step 6: Final answer
    x = 108.57

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.