Home / 20,854.08-28,783.68-12,891.50

Finding the Fourth Proportional to 20,854.08, 28,783.68 and 12,891.50

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Solution

The fourth proportional to 20,854.08, 28,783.68 and 12,891.50 is: 17,793.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,854.08 : 28,783.68 = 12,891.50 : x
  2. Step 2: Convert to fraction form
    20,854.08/28,783.68 = 12,891.50/x
  3. Step 3: Cross multiply
    20,854.08x = 28,783.68 × 12,891.50
  4. Step 4: Simplify right side
    20,854.08x = 371,064,810.72
  5. Step 5: Solve for x
    x = 371,064,810.72/20,854.08
  6. Step 6: Final answer
    x = 17,793.39

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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.