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Finding the Fourth Proportional to 388,317.69, 582,462.68 and 135,597.21

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Solution

The fourth proportional to 388,317.69, 582,462.68 and 135,597.21 is: 203,390.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,317.69 : 582,462.68 = 135,597.21 : x
  2. Step 2: Convert to fraction form
    388,317.69/582,462.68 = 135,597.21/x
  3. Step 3: Cross multiply
    388,317.69x = 582,462.68 × 135,597.21
  4. Step 4: Simplify right side
    388,317.69x = 78,980,311,474.90
  5. Step 5: Solve for x
    x = 78,980,311,474.90/388,317.69
  6. Step 6: Final answer
    x = 203,390.97

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.