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Finding the Fourth Proportional to 624.24, 860.90 and 449.55

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Solution

The fourth proportional to 624.24, 860.90 and 449.55 is: 619.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.24 : 860.90 = 449.55 : x
  2. Step 2: Convert to fraction form
    624.24/860.90 = 449.55/x
  3. Step 3: Cross multiply
    624.24x = 860.90 × 449.55
  4. Step 4: Simplify right side
    624.24x = 387,015.35
  5. Step 5: Solve for x
    x = 387,015.35/624.24
  6. Step 6: Final answer
    x = 619.98

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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.