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Finding the Fourth Proportional to 285.48, 428.06 and 157.32

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Solution

The fourth proportional to 285.48, 428.06 and 157.32 is: 235.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.48 : 428.06 = 157.32 : x
  2. Step 2: Convert to fraction form
    285.48/428.06 = 157.32/x
  3. Step 3: Cross multiply
    285.48x = 428.06 × 157.32
  4. Step 4: Simplify right side
    285.48x = 67,342.40
  5. Step 5: Solve for x
    x = 67,342.40/285.48
  6. Step 6: Final answer
    x = 235.89

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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.