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Finding the Fourth Proportional to 621.99, 858.33 and 342.22

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Solution

The fourth proportional to 621.99, 858.33 and 342.22 is: 472.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.99 : 858.33 = 342.22 : x
  2. Step 2: Convert to fraction form
    621.99/858.33 = 342.22/x
  3. Step 3: Cross multiply
    621.99x = 858.33 × 342.22
  4. Step 4: Simplify right side
    621.99x = 293,737.69
  5. Step 5: Solve for x
    x = 293,737.69/621.99
  6. Step 6: Final answer
    x = 472.25

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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.