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Finding the Fourth Proportional to 621.37, 858.06 and 400.70

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Solution

The fourth proportional to 621.37, 858.06 and 400.70 is: 553.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.37 : 858.06 = 400.70 : x
  2. Step 2: Convert to fraction form
    621.37/858.06 = 400.70/x
  3. Step 3: Cross multiply
    621.37x = 858.06 × 400.70
  4. Step 4: Simplify right side
    621.37x = 343,820.35
  5. Step 5: Solve for x
    x = 343,820.35/621.37
  6. Step 6: Final answer
    x = 553.33

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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.