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Finding the Fourth Proportional to 621.99, 858.46 and 400.93

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Solution

The fourth proportional to 621.99, 858.46 and 400.93 is: 553.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.99 : 858.46 = 400.93 : x
  2. Step 2: Convert to fraction form
    621.99/858.46 = 400.93/x
  3. Step 3: Cross multiply
    621.99x = 858.46 × 400.93
  4. Step 4: Simplify right side
    621.99x = 344,182.37
  5. Step 5: Solve for x
    x = 344,182.37/621.99
  6. Step 6: Final answer
    x = 553.36

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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.