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Finding the Fourth Proportional to 621.99, 858.39 and 342.24

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Solution

The fourth proportional to 621.99, 858.39 and 342.24 is: 472.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.99 : 858.39 = 342.24 : x
  2. Step 2: Convert to fraction form
    621.99/858.39 = 342.24/x
  3. Step 3: Cross multiply
    621.99x = 858.39 × 342.24
  4. Step 4: Simplify right side
    621.99x = 293,775.39
  5. Step 5: Solve for x
    x = 293,775.39/621.99
  6. Step 6: Final answer
    x = 472.32

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1.5x scale

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.