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Finding the Fourth Proportional to 620.01, 855.40 and 442.99

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Solution

The fourth proportional to 620.01, 855.40 and 442.99 is: 611.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.01 : 855.40 = 442.99 : x
  2. Step 2: Convert to fraction form
    620.01/855.40 = 442.99/x
  3. Step 3: Cross multiply
    620.01x = 855.40 × 442.99
  4. Step 4: Simplify right side
    620.01x = 378,933.65
  5. Step 5: Solve for x
    x = 378,933.65/620.01
  6. Step 6: Final answer
    x = 611.17

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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.