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Finding the Fourth Proportional to 7,291.80, 10,940.40 and 7,021.80

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Solution

The fourth proportional to 7,291.80, 10,940.40 and 7,021.80 is: 10,535.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,291.80 : 10,940.40 = 7,021.80 : x
  2. Step 2: Convert to fraction form
    7,291.80/10,940.40 = 7,021.80/x
  3. Step 3: Cross multiply
    7,291.80x = 10,940.40 × 7,021.80
  4. Step 4: Simplify right side
    7,291.80x = 76,821,300.72
  5. Step 5: Solve for x
    x = 76,821,300.72/7,291.80
  6. Step 6: Final answer
    x = 10,535.30

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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.