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Finding the Fourth Proportional to 285.30, 428.20 and 155.41

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Solution

The fourth proportional to 285.30, 428.20 and 155.41 is: 233.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.30 : 428.20 = 155.41 : x
  2. Step 2: Convert to fraction form
    285.30/428.20 = 155.41/x
  3. Step 3: Cross multiply
    285.30x = 428.20 × 155.41
  4. Step 4: Simplify right side
    285.30x = 66,545.10
  5. Step 5: Solve for x
    x = 66,545.10/285.30
  6. Step 6: Final answer
    x = 233.25

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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.