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Finding the Fourth Proportional to 28,989.60, 40,006.80 and 16,413.60

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Solution

The fourth proportional to 28,989.60, 40,006.80 and 16,413.60 is: 22,651.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,989.60 : 40,006.80 = 16,413.60 : x
  2. Step 2: Convert to fraction form
    28,989.60/40,006.80 = 16,413.60/x
  3. Step 3: Cross multiply
    28,989.60x = 40,006.80 × 16,413.60
  4. Step 4: Simplify right side
    28,989.60x = 656,655,612.48
  5. Step 5: Solve for x
    x = 656,655,612.48/28,989.60
  6. Step 6: Final answer
    x = 22,651.42

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1.5x scale

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.