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Finding the Fourth Proportional to 89.02, 122.98 and 70.74

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Solution

The fourth proportional to 89.02, 122.98 and 70.74 is: 97.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.02 : 122.98 = 70.74 : x
  2. Step 2: Convert to fraction form
    89.02/122.98 = 70.74/x
  3. Step 3: Cross multiply
    89.02x = 122.98 × 70.74
  4. Step 4: Simplify right side
    89.02x = 8,699.61
  5. Step 5: Solve for x
    x = 8,699.61/89.02
  6. Step 6: Final answer
    x = 97.73

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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.