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Finding the Fourth Proportional to 9,912.88, 13,681.80 and 5,720.56

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Solution

The fourth proportional to 9,912.88, 13,681.80 and 5,720.56 is: 7,895.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,912.88 : 13,681.80 = 5,720.56 : x
  2. Step 2: Convert to fraction form
    9,912.88/13,681.80 = 5,720.56/x
  3. Step 3: Cross multiply
    9,912.88x = 13,681.80 × 5,720.56
  4. Step 4: Simplify right side
    9,912.88x = 78,267,557.81
  5. Step 5: Solve for x
    x = 78,267,557.81/9,912.88
  6. Step 6: Final answer
    x = 7,895.54

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