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Finding the Fourth Proportional to 523.80, 723.60 and 518.40

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Solution

The fourth proportional to 523.80, 723.60 and 518.40 is: 716.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    523.80 : 723.60 = 518.40 : x
  2. Step 2: Convert to fraction form
    523.80/723.60 = 518.40/x
  3. Step 3: Cross multiply
    523.80x = 723.60 × 518.40
  4. Step 4: Simplify right side
    523.80x = 375,114.24
  5. Step 5: Solve for x
    x = 375,114.24/523.80
  6. Step 6: Final answer
    x = 716.14

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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.