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Finding the Fourth Proportional to 20,793.69, 28,687.16 and 12,822.08

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Solution

The fourth proportional to 20,793.69, 28,687.16 and 12,822.08 is: 17,689.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,793.69 : 28,687.16 = 12,822.08 : x
  2. Step 2: Convert to fraction form
    20,793.69/28,687.16 = 12,822.08/x
  3. Step 3: Cross multiply
    20,793.69x = 28,687.16 × 12,822.08
  4. Step 4: Simplify right side
    20,793.69x = 367,828,852.95
  5. Step 5: Solve for x
    x = 367,828,852.95/20,793.69
  6. Step 6: Final answer
    x = 17,689.45

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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.