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Finding the Fourth Proportional to 619.81, 854.91 and 423.59

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Solution

The fourth proportional to 619.81, 854.91 and 423.59 is: 584.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.81 : 854.91 = 423.59 : x
  2. Step 2: Convert to fraction form
    619.81/854.91 = 423.59/x
  3. Step 3: Cross multiply
    619.81x = 854.91 × 423.59
  4. Step 4: Simplify right side
    619.81x = 362,127.05
  5. Step 5: Solve for x
    x = 362,127.05/619.81
  6. Step 6: Final answer
    x = 584.26

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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.