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Finding the Fourth Proportional to 285.40, 427.47 and 163.59

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Solution

The fourth proportional to 285.40, 427.47 and 163.59 is: 245.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.40 : 427.47 = 163.59 : x
  2. Step 2: Convert to fraction form
    285.40/427.47 = 163.59/x
  3. Step 3: Cross multiply
    285.40x = 427.47 × 163.59
  4. Step 4: Simplify right side
    285.40x = 69,929.82
  5. Step 5: Solve for x
    x = 69,929.82/285.40
  6. Step 6: Final answer
    x = 245.02

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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.