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Finding the Fourth Proportional to 619.99, 855.56 and 340.21

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Solution

The fourth proportional to 619.99, 855.56 and 340.21 is: 469.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.99 : 855.56 = 340.21 : x
  2. Step 2: Convert to fraction form
    619.99/855.56 = 340.21/x
  3. Step 3: Cross multiply
    619.99x = 855.56 × 340.21
  4. Step 4: Simplify right side
    619.99x = 291,064.09
  5. Step 5: Solve for x
    x = 291,064.09/619.99
  6. Step 6: Final answer
    x = 469.47

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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.