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Finding the Fourth Proportional to 619.64, 855.30 and 423.08

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Solution

The fourth proportional to 619.64, 855.30 and 423.08 is: 583.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.64 : 855.30 = 423.08 : x
  2. Step 2: Convert to fraction form
    619.64/855.30 = 423.08/x
  3. Step 3: Cross multiply
    619.64x = 855.30 × 423.08
  4. Step 4: Simplify right side
    619.64x = 361,860.32
  5. Step 5: Solve for x
    x = 361,860.32/619.64
  6. Step 6: Final answer
    x = 583.98

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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.