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Finding the Fourth Proportional to 7,922.80, 10,938.81 and 7,080.81

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Solution

The fourth proportional to 7,922.80, 10,938.81 and 7,080.81 is: 9,776.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,922.80 : 10,938.81 = 7,080.81 : x
  2. Step 2: Convert to fraction form
    7,922.80/10,938.81 = 7,080.81/x
  3. Step 3: Cross multiply
    7,922.80x = 10,938.81 × 7,080.81
  4. Step 4: Simplify right side
    7,922.80x = 77,455,635.24
  5. Step 5: Solve for x
    x = 77,455,635.24/7,922.80
  6. Step 6: Final answer
    x = 9,776.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.