Home / 7,122.36-9,828.93-3,978.18

Finding the Fourth Proportional to 7,122.36, 9,828.93 and 3,978.18

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Solution

The fourth proportional to 7,122.36, 9,828.93 and 3,978.18 is: 5,489.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,122.36 : 9,828.93 = 3,978.18 : x
  2. Step 2: Convert to fraction form
    7,122.36/9,828.93 = 3,978.18/x
  3. Step 3: Cross multiply
    7,122.36x = 9,828.93 × 3,978.18
  4. Step 4: Simplify right side
    7,122.36x = 39,101,252.75
  5. Step 5: Solve for x
    x = 39,101,252.75/7,122.36
  6. Step 6: Final answer
    x = 5,489.93

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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.