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Finding the Fourth Proportional to 285.51, 428.16 and 155.61

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Solution

The fourth proportional to 285.51, 428.16 and 155.61 is: 233.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.51 : 428.16 = 155.61 : x
  2. Step 2: Convert to fraction form
    285.51/428.16 = 155.61/x
  3. Step 3: Cross multiply
    285.51x = 428.16 × 155.61
  4. Step 4: Simplify right side
    285.51x = 66,625.98
  5. Step 5: Solve for x
    x = 66,625.98/285.51
  6. Step 6: Final answer
    x = 233.36

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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.