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Finding the Fourth Proportional to 621.09, 857.06 and 400.11

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Solution

The fourth proportional to 621.09, 857.06 and 400.11 is: 552.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.09 : 857.06 = 400.11 : x
  2. Step 2: Convert to fraction form
    621.09/857.06 = 400.11/x
  3. Step 3: Cross multiply
    621.09x = 857.06 × 400.11
  4. Step 4: Simplify right side
    621.09x = 342,916.28
  5. Step 5: Solve for x
    x = 342,916.28/621.09
  6. Step 6: Final answer
    x = 552.12

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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.