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Finding the Fourth Proportional to 7,072.88, 9,760.88 and 3,929.06

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Solution

The fourth proportional to 7,072.88, 9,760.88 and 3,929.06 is: 5,422.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,072.88 : 9,760.88 = 3,929.06 : x
  2. Step 2: Convert to fraction form
    7,072.88/9,760.88 = 3,929.06/x
  3. Step 3: Cross multiply
    7,072.88x = 9,760.88 × 3,929.06
  4. Step 4: Simplify right side
    7,072.88x = 38,351,117.40
  5. Step 5: Solve for x
    x = 38,351,117.40/7,072.88
  6. Step 6: Final answer
    x = 5,422.28

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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.