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Finding the Fourth Proportional to 623.56, 860.17 and 387.55

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Solution

The fourth proportional to 623.56, 860.17 and 387.55 is: 534.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.56 : 860.17 = 387.55 : x
  2. Step 2: Convert to fraction form
    623.56/860.17 = 387.55/x
  3. Step 3: Cross multiply
    623.56x = 860.17 × 387.55
  4. Step 4: Simplify right side
    623.56x = 333,352.64
  5. Step 5: Solve for x
    x = 333,352.64/623.56
  6. Step 6: Final answer
    x = 534.60

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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.