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Finding the Fourth Proportional to 89.88, 123.74 and 70.18

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Solution

The fourth proportional to 89.88, 123.74 and 70.18 is: 96.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.88 : 123.74 = 70.18 : x
  2. Step 2: Convert to fraction form
    89.88/123.74 = 70.18/x
  3. Step 3: Cross multiply
    89.88x = 123.74 × 70.18
  4. Step 4: Simplify right side
    89.88x = 8,684.07
  5. Step 5: Solve for x
    x = 8,684.07/89.88
  6. Step 6: Final answer
    x = 96.62

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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.