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Finding the Fourth Proportional to 640,884.60, 961,413.30 and 220,289.40

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Solution

The fourth proportional to 640,884.60, 961,413.30 and 220,289.40 is: 330,463.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,884.60 : 961,413.30 = 220,289.40 : x
  2. Step 2: Convert to fraction form
    640,884.60/961,413.30 = 220,289.40/x
  3. Step 3: Cross multiply
    640,884.60x = 961,413.30 × 220,289.40
  4. Step 4: Simplify right side
    640,884.60x = 211,789,159,009.02
  5. Step 5: Solve for x
    x = 211,789,159,009.02/640,884.60
  6. Step 6: Final answer
    x = 330,463.80

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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.