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Finding the Fourth Proportional to 7,290, 10,060.20 and 3,978

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Solution

The fourth proportional to 7,290, 10,060.20 and 3,978 is: 5,489.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,290 : 10,060.20 = 3,978 : x
  2. Step 2: Convert to fraction form
    7,290/10,060.20 = 3,978/x
  3. Step 3: Cross multiply
    7,290x = 10,060.20 × 3,978
  4. Step 4: Simplify right side
    7,290x = 40,019,475.60
  5. Step 5: Solve for x
    x = 40,019,475.60/7,290
  6. Step 6: Final answer
    x = 5,489.64

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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.