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Finding the Fourth Proportional to 90.65, 125.15 and 61.58

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Solution

The fourth proportional to 90.65, 125.15 and 61.58 is: 85.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.65 : 125.15 = 61.58 : x
  2. Step 2: Convert to fraction form
    90.65/125.15 = 61.58/x
  3. Step 3: Cross multiply
    90.65x = 125.15 × 61.58
  4. Step 4: Simplify right side
    90.65x = 7,705.80
  5. Step 5: Solve for x
    x = 7,705.80/90.65
  6. Step 6: Final answer
    x = 85.01

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.