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Finding the Fourth Proportional to 720.15, 993.79 and 440.29

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Solution

The fourth proportional to 720.15, 993.79 and 440.29 is: 607.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.15 : 993.79 = 440.29 : x
  2. Step 2: Convert to fraction form
    720.15/993.79 = 440.29/x
  3. Step 3: Cross multiply
    720.15x = 993.79 × 440.29
  4. Step 4: Simplify right side
    720.15x = 437,548.63
  5. Step 5: Solve for x
    x = 437,548.63/720.15
  6. Step 6: Final answer
    x = 607.58

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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.