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Finding the Fourth Proportional to 7,072.96, 9,759.80 and 3,928.72

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Solution

The fourth proportional to 7,072.96, 9,759.80 and 3,928.72 is: 5,421.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,072.96 : 9,759.80 = 3,928.72 : x
  2. Step 2: Convert to fraction form
    7,072.96/9,759.80 = 3,928.72/x
  3. Step 3: Cross multiply
    7,072.96x = 9,759.80 × 3,928.72
  4. Step 4: Simplify right side
    7,072.96x = 38,343,521.46
  5. Step 5: Solve for x
    x = 38,343,521.46/7,072.96
  6. Step 6: Final answer
    x = 5,421.14

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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.