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Finding the Fourth Proportional to 720.12, 993.42 and 513.24

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Solution

The fourth proportional to 720.12, 993.42 and 513.24 is: 708.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.12 : 993.42 = 513.24 : x
  2. Step 2: Convert to fraction form
    720.12/993.42 = 513.24/x
  3. Step 3: Cross multiply
    720.12x = 993.42 × 513.24
  4. Step 4: Simplify right side
    720.12x = 509,862.88
  5. Step 5: Solve for x
    x = 509,862.88/720.12
  6. Step 6: Final answer
    x = 708.02

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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.