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Finding the Fourth Proportional to 647.63, 894.18 and 399.02

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Solution

The fourth proportional to 647.63, 894.18 and 399.02 is: 550.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.63 : 894.18 = 399.02 : x
  2. Step 2: Convert to fraction form
    647.63/894.18 = 399.02/x
  3. Step 3: Cross multiply
    647.63x = 894.18 × 399.02
  4. Step 4: Simplify right side
    647.63x = 356,791.23
  5. Step 5: Solve for x
    x = 356,791.23/647.63
  6. Step 6: Final answer
    x = 550.92

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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.