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Finding the Fourth Proportional to 623.78, 860.78 and 375.05

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Solution

The fourth proportional to 623.78, 860.78 and 375.05 is: 517.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.78 : 860.78 = 375.05 : x
  2. Step 2: Convert to fraction form
    623.78/860.78 = 375.05/x
  3. Step 3: Cross multiply
    623.78x = 860.78 × 375.05
  4. Step 4: Simplify right side
    623.78x = 322,835.54
  5. Step 5: Solve for x
    x = 322,835.54/623.78
  6. Step 6: Final answer
    x = 517.55

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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.