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Finding the Fourth Proportional to 89.85, 123.93 and 71.43

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Solution

The fourth proportional to 89.85, 123.93 and 71.43 is: 98.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.85 : 123.93 = 71.43 : x
  2. Step 2: Convert to fraction form
    89.85/123.93 = 71.43/x
  3. Step 3: Cross multiply
    89.85x = 123.93 × 71.43
  4. Step 4: Simplify right side
    89.85x = 8,852.32
  5. Step 5: Solve for x
    x = 8,852.32/89.85
  6. Step 6: Final answer
    x = 98.52

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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.