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Finding the Fourth Proportional to 715.23, 986.85 and 518.40

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Solution

The fourth proportional to 715.23, 986.85 and 518.40 is: 715.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.23 : 986.85 = 518.40 : x
  2. Step 2: Convert to fraction form
    715.23/986.85 = 518.40/x
  3. Step 3: Cross multiply
    715.23x = 986.85 × 518.40
  4. Step 4: Simplify right side
    715.23x = 511,583.04
  5. Step 5: Solve for x
    x = 511,583.04/715.23
  6. Step 6: Final answer
    x = 715.27

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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.