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Finding the Fourth Proportional to 640,444.92, 961,269.30 and 325,128.12

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Solution

The fourth proportional to 640,444.92, 961,269.30 and 325,128.12 is: 487,997.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,444.92 : 961,269.30 = 325,128.12 : x
  2. Step 2: Convert to fraction form
    640,444.92/961,269.30 = 325,128.12/x
  3. Step 3: Cross multiply
    640,444.92x = 961,269.30 × 325,128.12
  4. Step 4: Simplify right side
    640,444.92x = 312,535,680,322.72
  5. Step 5: Solve for x
    x = 312,535,680,322.72/640,444.92
  6. Step 6: Final answer
    x = 487,997.75

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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.