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Finding the Fourth Proportional to 89.19, 123.21 and 71.50

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Solution

The fourth proportional to 89.19, 123.21 and 71.50 is: 98.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.19 : 123.21 = 71.50 : x
  2. Step 2: Convert to fraction form
    89.19/123.21 = 71.50/x
  3. Step 3: Cross multiply
    89.19x = 123.21 × 71.50
  4. Step 4: Simplify right side
    89.19x = 8,809.52
  5. Step 5: Solve for x
    x = 8,809.52/89.19
  6. Step 6: Final answer
    x = 98.77

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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.