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Finding the Fourth Proportional to 619.99, 928.91 and 424.76

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Solution

The fourth proportional to 619.99, 928.91 and 424.76 is: 636.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.99 : 928.91 = 424.76 : x
  2. Step 2: Convert to fraction form
    619.99/928.91 = 424.76/x
  3. Step 3: Cross multiply
    619.99x = 928.91 × 424.76
  4. Step 4: Simplify right side
    619.99x = 394,558.55
  5. Step 5: Solve for x
    x = 394,558.55/619.99
  6. Step 6: Final answer
    x = 636.39

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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.