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Finding the Fourth Proportional to 20,697.88, 30,896.55 and 19,155.96

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Solution

The fourth proportional to 20,697.88, 30,896.55 and 19,155.96 is: 28,594.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,697.88 : 30,896.55 = 19,155.96 : x
  2. Step 2: Convert to fraction form
    20,697.88/30,896.55 = 19,155.96/x
  3. Step 3: Cross multiply
    20,697.88x = 30,896.55 × 19,155.96
  4. Step 4: Simplify right side
    20,697.88x = 591,853,075.94
  5. Step 5: Solve for x
    x = 591,853,075.94/20,697.88
  6. Step 6: Final answer
    x = 28,594.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.