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Finding the Fourth Proportional to 862.60, 1,190.48 and 513.29

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Solution

The fourth proportional to 862.60, 1,190.48 and 513.29 is: 708.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.60 : 1,190.48 = 513.29 : x
  2. Step 2: Convert to fraction form
    862.60/1,190.48 = 513.29/x
  3. Step 3: Cross multiply
    862.60x = 1,190.48 × 513.29
  4. Step 4: Simplify right side
    862.60x = 611,056.81
  5. Step 5: Solve for x
    x = 611,056.81/862.60
  6. Step 6: Final answer
    x = 708.39

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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.