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Finding the Fourth Proportional to 19,877.80, 29,816.70 and 12,879.40

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Solution

The fourth proportional to 19,877.80, 29,816.70 and 12,879.40 is: 19,319.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,877.80 : 29,816.70 = 12,879.40 : x
  2. Step 2: Convert to fraction form
    19,877.80/29,816.70 = 12,879.40/x
  3. Step 3: Cross multiply
    19,877.80x = 29,816.70 × 12,879.40
  4. Step 4: Simplify right side
    19,877.80x = 384,021,205.98
  5. Step 5: Solve for x
    x = 384,021,205.98/19,877.80
  6. Step 6: Final answer
    x = 19,319.10

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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.