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Finding the Fourth Proportional to 621.94, 858.28 and 342.20

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Solution

The fourth proportional to 621.94, 858.28 and 342.20 is: 472.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.94 : 858.28 = 342.20 : x
  2. Step 2: Convert to fraction form
    621.94/858.28 = 342.20/x
  3. Step 3: Cross multiply
    621.94x = 858.28 × 342.20
  4. Step 4: Simplify right side
    621.94x = 293,703.42
  5. Step 5: Solve for x
    x = 293,703.42/621.94
  6. Step 6: Final answer
    x = 472.24

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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.