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Finding the Fourth Proportional to 28,985.80, 39,998.50 and 16,411.40

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Solution

The fourth proportional to 28,985.80, 39,998.50 and 16,411.40 is: 22,646.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,985.80 : 39,998.50 = 16,411.40 : x
  2. Step 2: Convert to fraction form
    28,985.80/39,998.50 = 16,411.40/x
  3. Step 3: Cross multiply
    28,985.80x = 39,998.50 × 16,411.40
  4. Step 4: Simplify right side
    28,985.80x = 656,431,382.90
  5. Step 5: Solve for x
    x = 656,431,382.90/28,985.80
  6. Step 6: Final answer
    x = 22,646.65

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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.