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Finding the Fourth Proportional to 647.87, 894.52 and 399.27

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Solution

The fourth proportional to 647.87, 894.52 and 399.27 is: 551.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.87 : 894.52 = 399.27 : x
  2. Step 2: Convert to fraction form
    647.87/894.52 = 399.27/x
  3. Step 3: Cross multiply
    647.87x = 894.52 × 399.27
  4. Step 4: Simplify right side
    647.87x = 357,150.53
  5. Step 5: Solve for x
    x = 357,150.53/647.87
  6. Step 6: Final answer
    x = 551.27

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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.