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Finding the Fourth Proportional to 285.14, 427.62 and 90.15

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Solution

The fourth proportional to 285.14, 427.62 and 90.15 is: 135.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.14 : 427.62 = 90.15 : x
  2. Step 2: Convert to fraction form
    285.14/427.62 = 90.15/x
  3. Step 3: Cross multiply
    285.14x = 427.62 × 90.15
  4. Step 4: Simplify right side
    285.14x = 38,549.94
  5. Step 5: Solve for x
    x = 38,549.94/285.14
  6. Step 6: Final answer
    x = 135.20

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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.