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Finding the Fourth Proportional to 640,169.12, 883,155.86 and 385,372.69

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Solution

The fourth proportional to 640,169.12, 883,155.86 and 385,372.69 is: 531,647.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,169.12 : 883,155.86 = 385,372.69 : x
  2. Step 2: Convert to fraction form
    640,169.12/883,155.86 = 385,372.69/x
  3. Step 3: Cross multiply
    640,169.12x = 883,155.86 × 385,372.69
  4. Step 4: Simplify right side
    640,169.12x = 340,344,146,767.86
  5. Step 5: Solve for x
    x = 340,344,146,767.86/640,169.12
  6. Step 6: Final answer
    x = 531,647.24

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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.