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Finding the Fourth Proportional to 18,940.80, 28,411.20 and 10,646.40

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Solution

The fourth proportional to 18,940.80, 28,411.20 and 10,646.40 is: 15,969.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,940.80 : 28,411.20 = 10,646.40 : x
  2. Step 2: Convert to fraction form
    18,940.80/28,411.20 = 10,646.40/x
  3. Step 3: Cross multiply
    18,940.80x = 28,411.20 × 10,646.40
  4. Step 4: Simplify right side
    18,940.80x = 302,476,999.68
  5. Step 5: Solve for x
    x = 302,476,999.68/18,940.80
  6. Step 6: Final answer
    x = 15,969.60

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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.