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Finding the Fourth Proportional to 405,189.55, 607,889.40 and 215,493.94

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Solution

The fourth proportional to 405,189.55, 607,889.40 and 215,493.94 is: 323,296.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,189.55 : 607,889.40 = 215,493.94 : x
  2. Step 2: Convert to fraction form
    405,189.55/607,889.40 = 215,493.94/x
  3. Step 3: Cross multiply
    405,189.55x = 607,889.40 × 215,493.94
  4. Step 4: Simplify right side
    405,189.55x = 130,996,481,890.24
  5. Step 5: Solve for x
    x = 130,996,481,890.24/405,189.55
  6. Step 6: Final answer
    x = 323,296.79

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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.