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Finding the Fourth Proportional to 621.72, 858.56 and 401.06

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Solution

The fourth proportional to 621.72, 858.56 and 401.06 is: 553.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.72 : 858.56 = 401.06 : x
  2. Step 2: Convert to fraction form
    621.72/858.56 = 401.06/x
  3. Step 3: Cross multiply
    621.72x = 858.56 × 401.06
  4. Step 4: Simplify right side
    621.72x = 344,334.21
  5. Step 5: Solve for x
    x = 344,334.21/621.72
  6. Step 6: Final answer
    x = 553.84

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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.