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Finding the Fourth Proportional to 621.87, 858.19 and 342.12

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Solution

The fourth proportional to 621.87, 858.19 and 342.12 is: 472.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.87 : 858.19 = 342.12 : x
  2. Step 2: Convert to fraction form
    621.87/858.19 = 342.12/x
  3. Step 3: Cross multiply
    621.87x = 858.19 × 342.12
  4. Step 4: Simplify right side
    621.87x = 293,603.96
  5. Step 5: Solve for x
    x = 293,603.96/621.87
  6. Step 6: Final answer
    x = 472.13

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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.