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Finding the Fourth Proportional to 285.40, 427.62 and 157.24

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Solution

The fourth proportional to 285.40, 427.62 and 157.24 is: 235.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.40 : 427.62 = 157.24 : x
  2. Step 2: Convert to fraction form
    285.40/427.62 = 157.24/x
  3. Step 3: Cross multiply
    285.40x = 427.62 × 157.24
  4. Step 4: Simplify right side
    285.40x = 67,238.97
  5. Step 5: Solve for x
    x = 67,238.97/285.40
  6. Step 6: Final answer
    x = 235.60

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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.