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Finding the Fourth Proportional to 28,218.80, 42,295.80 and 11,570.60

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Solution

The fourth proportional to 28,218.80, 42,295.80 and 11,570.60 is: 17,342.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,218.80 : 42,295.80 = 11,570.60 : x
  2. Step 2: Convert to fraction form
    28,218.80/42,295.80 = 11,570.60/x
  3. Step 3: Cross multiply
    28,218.80x = 42,295.80 × 11,570.60
  4. Step 4: Simplify right side
    28,218.80x = 489,387,783.48
  5. Step 5: Solve for x
    x = 489,387,783.48/28,218.80
  6. Step 6: Final answer
    x = 17,342.61

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1.5x scale

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.