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Finding the Fourth Proportional to 287,608.80, 431,413.20 and 259,615.20

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Solution

The fourth proportional to 287,608.80, 431,413.20 and 259,615.20 is: 389,422.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,608.80 : 431,413.20 = 259,615.20 : x
  2. Step 2: Convert to fraction form
    287,608.80/431,413.20 = 259,615.20/x
  3. Step 3: Cross multiply
    287,608.80x = 431,413.20 × 259,615.20
  4. Step 4: Simplify right side
    287,608.80x = 112,001,424,200.64
  5. Step 5: Solve for x
    x = 112,001,424,200.64/287,608.80
  6. Step 6: Final answer
    x = 389,422.80

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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.