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Finding the Fourth Proportional to 623.10, 860.09 and 455.70

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Solution

The fourth proportional to 623.10, 860.09 and 455.70 is: 629.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.10 : 860.09 = 455.70 : x
  2. Step 2: Convert to fraction form
    623.10/860.09 = 455.70/x
  3. Step 3: Cross multiply
    623.10x = 860.09 × 455.70
  4. Step 4: Simplify right side
    623.10x = 391,940.73
  5. Step 5: Solve for x
    x = 391,940.73/623.10
  6. Step 6: Final answer
    x = 629.02

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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.