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Finding the Fourth Proportional to 621.75, 858.27 and 400.77

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Solution

The fourth proportional to 621.75, 858.27 and 400.77 is: 553.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.75 : 858.27 = 400.77 : x
  2. Step 2: Convert to fraction form
    621.75/858.27 = 400.77/x
  3. Step 3: Cross multiply
    621.75x = 858.27 × 400.77
  4. Step 4: Simplify right side
    621.75x = 343,968.87
  5. Step 5: Solve for x
    x = 343,968.87/621.75
  6. Step 6: Final answer
    x = 553.23

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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.