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Finding the Fourth Proportional to 642,169.38, 886,193.72 and 355,707.92

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Solution

The fourth proportional to 642,169.38, 886,193.72 and 355,707.92 is: 490,876.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,169.38 : 886,193.72 = 355,707.92 : x
  2. Step 2: Convert to fraction form
    642,169.38/886,193.72 = 355,707.92/x
  3. Step 3: Cross multiply
    642,169.38x = 886,193.72 × 355,707.92
  4. Step 4: Simplify right side
    642,169.38x = 315,226,120,427.29
  5. Step 5: Solve for x
    x = 315,226,120,427.29/642,169.38
  6. Step 6: Final answer
    x = 490,876.91

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1.5x scale

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.