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Finding the Fourth Proportional to 492.53, 679.59 and 387.63

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Solution

The fourth proportional to 492.53, 679.59 and 387.63 is: 534.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.53 : 679.59 = 387.63 : x
  2. Step 2: Convert to fraction form
    492.53/679.59 = 387.63/x
  3. Step 3: Cross multiply
    492.53x = 679.59 × 387.63
  4. Step 4: Simplify right side
    492.53x = 263,429.47
  5. Step 5: Solve for x
    x = 263,429.47/492.53
  6. Step 6: Final answer
    x = 534.86

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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.