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Finding the Fourth Proportional to 285.89, 428.99 and 155.88

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Solution

The fourth proportional to 285.89, 428.99 and 155.88 is: 233.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.89 : 428.99 = 155.88 : x
  2. Step 2: Convert to fraction form
    285.89/428.99 = 155.88/x
  3. Step 3: Cross multiply
    285.89x = 428.99 × 155.88
  4. Step 4: Simplify right side
    285.89x = 66,870.18
  5. Step 5: Solve for x
    x = 66,870.18/285.89
  6. Step 6: Final answer
    x = 233.91

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Why These Related Problems?

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