Home / 7,122.32-9,828.80-4,138.72

Finding the Fourth Proportional to 7,122.32, 9,828.80 and 4,138.72

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Solution

The fourth proportional to 7,122.32, 9,828.80 and 4,138.72 is: 5,711.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,122.32 : 9,828.80 = 4,138.72 : x
  2. Step 2: Convert to fraction form
    7,122.32/9,828.80 = 4,138.72/x
  3. Step 3: Cross multiply
    7,122.32x = 9,828.80 × 4,138.72
  4. Step 4: Simplify right side
    7,122.32x = 40,678,651.14
  5. Step 5: Solve for x
    x = 40,678,651.14/7,122.32
  6. Step 6: Final answer
    x = 5,711.43

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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.