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Finding the Fourth Proportional to 7,220.40, 10,852.20 and 7,090.80

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Solution

The fourth proportional to 7,220.40, 10,852.20 and 7,090.80 is: 10,657.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,220.40 : 10,852.20 = 7,090.80 : x
  2. Step 2: Convert to fraction form
    7,220.40/10,852.20 = 7,090.80/x
  3. Step 3: Cross multiply
    7,220.40x = 10,852.20 × 7,090.80
  4. Step 4: Simplify right side
    7,220.40x = 76,950,779.76
  5. Step 5: Solve for x
    x = 76,950,779.76/7,220.40
  6. Step 6: Final answer
    x = 10,657.41

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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.