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Finding the Fourth Proportional to 7,072.79, 9,760.74 and 3,928.98

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Solution

The fourth proportional to 7,072.79, 9,760.74 and 3,928.98 is: 5,422.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,072.79 : 9,760.74 = 3,928.98 : x
  2. Step 2: Convert to fraction form
    7,072.79/9,760.74 = 3,928.98/x
  3. Step 3: Cross multiply
    7,072.79x = 9,760.74 × 3,928.98
  4. Step 4: Simplify right side
    7,072.79x = 38,349,752.25
  5. Step 5: Solve for x
    x = 38,349,752.25/7,072.79
  6. Step 6: Final answer
    x = 5,422.16

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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.