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Finding the Fourth Proportional to 619.60, 854.88 and 423.28

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Solution

The fourth proportional to 619.60, 854.88 and 423.28 is: 584.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.60 : 854.88 = 423.28 : x
  2. Step 2: Convert to fraction form
    619.60/854.88 = 423.28/x
  3. Step 3: Cross multiply
    619.60x = 854.88 × 423.28
  4. Step 4: Simplify right side
    619.60x = 361,853.61
  5. Step 5: Solve for x
    x = 361,853.61/619.60
  6. Step 6: Final answer
    x = 584.01

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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.