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Finding the Fourth Proportional to 621.49, 857.49 and 400.57

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Solution

The fourth proportional to 621.49, 857.49 and 400.57 is: 552.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.49 : 857.49 = 400.57 : x
  2. Step 2: Convert to fraction form
    621.49/857.49 = 400.57/x
  3. Step 3: Cross multiply
    621.49x = 857.49 × 400.57
  4. Step 4: Simplify right side
    621.49x = 343,485.34
  5. Step 5: Solve for x
    x = 343,485.34/621.49
  6. Step 6: Final answer
    x = 552.68

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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.