Home / 20,428.80-30,643.20-18,225.60

Finding the Fourth Proportional to 20,428.80, 30,643.20 and 18,225.60

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Solution

The fourth proportional to 20,428.80, 30,643.20 and 18,225.60 is: 27,338.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,428.80 : 30,643.20 = 18,225.60 : x
  2. Step 2: Convert to fraction form
    20,428.80/30,643.20 = 18,225.60/x
  3. Step 3: Cross multiply
    20,428.80x = 30,643.20 × 18,225.60
  4. Step 4: Simplify right side
    20,428.80x = 558,490,705.92
  5. Step 5: Solve for x
    x = 558,490,705.92/20,428.80
  6. Step 6: Final answer
    x = 27,338.40

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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.