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Finding the Fourth Proportional to 623.62, 860.38 and 387.49

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Solution

The fourth proportional to 623.62, 860.38 and 387.49 is: 534.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.62 : 860.38 = 387.49 : x
  2. Step 2: Convert to fraction form
    623.62/860.38 = 387.49/x
  3. Step 3: Cross multiply
    623.62x = 860.38 × 387.49
  4. Step 4: Simplify right side
    623.62x = 333,384.34
  5. Step 5: Solve for x
    x = 333,384.34/623.62
  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.