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Finding the Fourth Proportional to 285.71, 428.19 and 131.62

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Solution

The fourth proportional to 285.71, 428.19 and 131.62 is: 197.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.71 : 428.19 = 131.62 : x
  2. Step 2: Convert to fraction form
    285.71/428.19 = 131.62/x
  3. Step 3: Cross multiply
    285.71x = 428.19 × 131.62
  4. Step 4: Simplify right side
    285.71x = 56,356.23
  5. Step 5: Solve for x
    x = 56,356.23/285.71
  6. Step 6: Final answer
    x = 197.25

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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.