Home / 21,920.40-32,880.60-8,782.20

Finding the Fourth Proportional to 21,920.40, 32,880.60 and 8,782.20

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Solution

The fourth proportional to 21,920.40, 32,880.60 and 8,782.20 is: 13,173.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,920.40 : 32,880.60 = 8,782.20 : x
  2. Step 2: Convert to fraction form
    21,920.40/32,880.60 = 8,782.20/x
  3. Step 3: Cross multiply
    21,920.40x = 32,880.60 × 8,782.20
  4. Step 4: Simplify right side
    21,920.40x = 288,764,005.32
  5. Step 5: Solve for x
    x = 288,764,005.32/21,920.40
  6. Step 6: Final answer
    x = 13,173.30

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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.