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Finding the Fourth Proportional to 651.92, 899.36 and 399.65

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Solution

The fourth proportional to 651.92, 899.36 and 399.65 is: 551.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.92 : 899.36 = 399.65 : x
  2. Step 2: Convert to fraction form
    651.92/899.36 = 399.65/x
  3. Step 3: Cross multiply
    651.92x = 899.36 × 399.65
  4. Step 4: Simplify right side
    651.92x = 359,422.73
  5. Step 5: Solve for x
    x = 359,422.73/651.92
  6. Step 6: Final answer
    x = 551.33

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.