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Finding the Fourth Proportional to 515.53, 712.78 and 492.58

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Solution

The fourth proportional to 515.53, 712.78 and 492.58 is: 681.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.53 : 712.78 = 492.58 : x
  2. Step 2: Convert to fraction form
    515.53/712.78 = 492.58/x
  3. Step 3: Cross multiply
    515.53x = 712.78 × 492.58
  4. Step 4: Simplify right side
    515.53x = 351,103.60
  5. Step 5: Solve for x
    x = 351,103.60/515.53
  6. Step 6: Final answer
    x = 681.05

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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.