Home / 7,122.20-9,828.84-3,978.32

Finding the Fourth Proportional to 7,122.20, 9,828.84 and 3,978.32

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Solution

The fourth proportional to 7,122.20, 9,828.84 and 3,978.32 is: 5,490.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,122.20 : 9,828.84 = 3,978.32 : x
  2. Step 2: Convert to fraction form
    7,122.20/9,828.84 = 3,978.32/x
  3. Step 3: Cross multiply
    7,122.20x = 9,828.84 × 3,978.32
  4. Step 4: Simplify right side
    7,122.20x = 39,102,201.71
  5. Step 5: Solve for x
    x = 39,102,201.71/7,122.20
  6. Step 6: Final answer
    x = 5,490.19

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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.