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Finding the Fourth Proportional to 325.90, 487.77 and 285.80

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Solution

The fourth proportional to 325.90, 487.77 and 285.80 is: 427.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.90 : 487.77 = 285.80 : x
  2. Step 2: Convert to fraction form
    325.90/487.77 = 285.80/x
  3. Step 3: Cross multiply
    325.90x = 487.77 × 285.80
  4. Step 4: Simplify right side
    325.90x = 139,404.81
  5. Step 5: Solve for x
    x = 139,404.81/325.90
  6. Step 6: Final answer
    x = 427.76

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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.