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Finding the Fourth Proportional to 861,059.70, 1,290,889.71 and 300,487.86

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Solution

The fourth proportional to 861,059.70, 1,290,889.71 and 300,487.86 is: 450,487.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    861,059.70 : 1,290,889.71 = 300,487.86 : x
  2. Step 2: Convert to fraction form
    861,059.70/1,290,889.71 = 300,487.86/x
  3. Step 3: Cross multiply
    861,059.70x = 1,290,889.71 × 300,487.86
  4. Step 4: Simplify right side
    861,059.70x = 387,896,686,453.92
  5. Step 5: Solve for x
    x = 387,896,686,453.92/861,059.70
  6. Step 6: Final answer
    x = 450,487.56

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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.