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Finding the Fourth Proportional to 640,908.40, 961,289.70 and 167,641.60

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Solution

The fourth proportional to 640,908.40, 961,289.70 and 167,641.60 is: 251,443.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,908.40 : 961,289.70 = 167,641.60 : x
  2. Step 2: Convert to fraction form
    640,908.40/961,289.70 = 167,641.60/x
  3. Step 3: Cross multiply
    640,908.40x = 961,289.70 × 167,641.60
  4. Step 4: Simplify right side
    640,908.40x = 161,152,143,371.52
  5. Step 5: Solve for x
    x = 161,152,143,371.52/640,908.40
  6. Step 6: Final answer
    x = 251,443.33

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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.