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Finding the Fourth Proportional to 712.62, 983.39 and 515.79

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Solution

The fourth proportional to 712.62, 983.39 and 515.79 is: 711.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.62 : 983.39 = 515.79 : x
  2. Step 2: Convert to fraction form
    712.62/983.39 = 515.79/x
  3. Step 3: Cross multiply
    712.62x = 983.39 × 515.79
  4. Step 4: Simplify right side
    712.62x = 507,220.15
  5. Step 5: Solve for x
    x = 507,220.15/712.62
  6. Step 6: Final answer
    x = 711.77

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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.