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Finding the Fourth Proportional to 21,919.80, 32,879.70 and 12,078.30

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Solution

The fourth proportional to 21,919.80, 32,879.70 and 12,078.30 is: 18,117.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,919.80 : 32,879.70 = 12,078.30 : x
  2. Step 2: Convert to fraction form
    21,919.80/32,879.70 = 12,078.30/x
  3. Step 3: Cross multiply
    21,919.80x = 32,879.70 × 12,078.30
  4. Step 4: Simplify right side
    21,919.80x = 397,130,880.51
  5. Step 5: Solve for x
    x = 397,130,880.51/21,919.80
  6. Step 6: Final answer
    x = 18,117.45

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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.