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Finding the Fourth Proportional to 623.71, 860.85 and 488.85

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Solution

The fourth proportional to 623.71, 860.85 and 488.85 is: 674.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.71 : 860.85 = 488.85 : x
  2. Step 2: Convert to fraction form
    623.71/860.85 = 488.85/x
  3. Step 3: Cross multiply
    623.71x = 860.85 × 488.85
  4. Step 4: Simplify right side
    623.71x = 420,826.52
  5. Step 5: Solve for x
    x = 420,826.52/623.71
  6. Step 6: Final answer
    x = 674.72

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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.