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Finding the Fourth Proportional to 499,419.01, 689,041.20 and 305,624.69

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Solution

The fourth proportional to 499,419.01, 689,041.20 and 305,624.69 is: 421,665.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    499,419.01 : 689,041.20 = 305,624.69 : x
  2. Step 2: Convert to fraction form
    499,419.01/689,041.20 = 305,624.69/x
  3. Step 3: Cross multiply
    499,419.01x = 689,041.20 × 305,624.69
  4. Step 4: Simplify right side
    499,419.01x = 210,588,003,147.23
  5. Step 5: Solve for x
    x = 210,588,003,147.23/499,419.01
  6. Step 6: Final answer
    x = 421,665.97

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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.