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Finding the Fourth Proportional to 651.81, 978.03 and 408.27

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Solution

The fourth proportional to 651.81, 978.03 and 408.27 is: 612.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.81 : 978.03 = 408.27 : x
  2. Step 2: Convert to fraction form
    651.81/978.03 = 408.27/x
  3. Step 3: Cross multiply
    651.81x = 978.03 × 408.27
  4. Step 4: Simplify right side
    651.81x = 399,300.31
  5. Step 5: Solve for x
    x = 399,300.31/651.81
  6. Step 6: Final answer
    x = 612.60

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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.