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Finding the Fourth Proportional to 647.56, 894.12 and 399.24

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Solution

The fourth proportional to 647.56, 894.12 and 399.24 is: 551.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.56 : 894.12 = 399.24 : x
  2. Step 2: Convert to fraction form
    647.56/894.12 = 399.24/x
  3. Step 3: Cross multiply
    647.56x = 894.12 × 399.24
  4. Step 4: Simplify right side
    647.56x = 356,968.47
  5. Step 5: Solve for x
    x = 356,968.47/647.56
  6. Step 6: Final answer
    x = 551.25

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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.