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Finding the Fourth Proportional to 5,380.80, 8,014.80 and 5,128.16

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Solution

The fourth proportional to 5,380.80, 8,014.80 and 5,128.16 is: 7,638.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,380.80 : 8,014.80 = 5,128.16 : x
  2. Step 2: Convert to fraction form
    5,380.80/8,014.80 = 5,128.16/x
  3. Step 3: Cross multiply
    5,380.80x = 8,014.80 × 5,128.16
  4. Step 4: Simplify right side
    5,380.80x = 41,101,176.77
  5. Step 5: Solve for x
    x = 41,101,176.77/5,380.80
  6. Step 6: Final answer
    x = 7,638.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.