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Finding the Fourth Proportional to 54,689.60, 81,969.60 and 28,380.80

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Solution

The fourth proportional to 54,689.60, 81,969.60 and 28,380.80 is: 42,537.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,689.60 : 81,969.60 = 28,380.80 : x
  2. Step 2: Convert to fraction form
    54,689.60/81,969.60 = 28,380.80/x
  3. Step 3: Cross multiply
    54,689.60x = 81,969.60 × 28,380.80
  4. Step 4: Simplify right side
    54,689.60x = 2,326,362,823.68
  5. Step 5: Solve for x
    x = 2,326,362,823.68/54,689.60
  6. Step 6: Final answer
    x = 42,537.57

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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.