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Finding the Fourth Proportional to 20,442.80, 30,671.40 and 19,722.80

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Solution

The fourth proportional to 20,442.80, 30,671.40 and 19,722.80 is: 29,591.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,442.80 : 30,671.40 = 19,722.80 : x
  2. Step 2: Convert to fraction form
    20,442.80/30,671.40 = 19,722.80/x
  3. Step 3: Cross multiply
    20,442.80x = 30,671.40 × 19,722.80
  4. Step 4: Simplify right side
    20,442.80x = 604,925,887.92
  5. Step 5: Solve for x
    x = 604,925,887.92/20,442.80
  6. Step 6: Final answer
    x = 29,591.15

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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.