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Finding the Fourth Proportional to 7,980.78, 11,013.12 and 4,443.78

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Solution

The fourth proportional to 7,980.78, 11,013.12 and 4,443.78 is: 6,132.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,980.78 : 11,013.12 = 4,443.78 : x
  2. Step 2: Convert to fraction form
    7,980.78/11,013.12 = 4,443.78/x
  3. Step 3: Cross multiply
    7,980.78x = 11,013.12 × 4,443.78
  4. Step 4: Simplify right side
    7,980.78x = 48,939,882.39
  5. Step 5: Solve for x
    x = 48,939,882.39/7,980.78
  6. Step 6: Final answer
    x = 6,132.22

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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.