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Finding the Fourth Proportional to 642,313.27, 886,327.72 and 355,779.82

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Solution

The fourth proportional to 642,313.27, 886,327.72 and 355,779.82 is: 490,940.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,313.27 : 886,327.72 = 355,779.82 : x
  2. Step 2: Convert to fraction form
    642,313.27/886,327.72 = 355,779.82/x
  3. Step 3: Cross multiply
    642,313.27x = 886,327.72 × 355,779.82
  4. Step 4: Simplify right side
    642,313.27x = 315,337,514,903.71
  5. Step 5: Solve for x
    x = 315,337,514,903.71/642,313.27
  6. Step 6: Final answer
    x = 490,940.37

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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.