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Finding the Fourth Proportional to 7,121.16, 9,820.98 and 5,128.56

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Solution

The fourth proportional to 7,121.16, 9,820.98 and 5,128.56 is: 7,072.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,121.16 : 9,820.98 = 5,128.56 : x
  2. Step 2: Convert to fraction form
    7,121.16/9,820.98 = 5,128.56/x
  3. Step 3: Cross multiply
    7,121.16x = 9,820.98 × 5,128.56
  4. Step 4: Simplify right side
    7,121.16x = 50,367,485.19
  5. Step 5: Solve for x
    x = 50,367,485.19/7,121.16
  6. Step 6: Final answer
    x = 7,072.93

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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.