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Finding the Fourth Proportional to 285.06, 427.58 and 79.65

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Solution

The fourth proportional to 285.06, 427.58 and 79.65 is: 119.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.06 : 427.58 = 79.65 : x
  2. Step 2: Convert to fraction form
    285.06/427.58 = 79.65/x
  3. Step 3: Cross multiply
    285.06x = 427.58 × 79.65
  4. Step 4: Simplify right side
    285.06x = 34,056.75
  5. Step 5: Solve for x
    x = 34,056.75/285.06
  6. Step 6: Final answer
    x = 119.47

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.