Home / 12,405.78-17,118.54-7,100.28

Finding the Fourth Proportional to 12,405.78, 17,118.54 and 7,100.28

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Solution

The fourth proportional to 12,405.78, 17,118.54 and 7,100.28 is: 9,797.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,405.78 : 17,118.54 = 7,100.28 : x
  2. Step 2: Convert to fraction form
    12,405.78/17,118.54 = 7,100.28/x
  3. Step 3: Cross multiply
    12,405.78x = 17,118.54 × 7,100.28
  4. Step 4: Simplify right side
    12,405.78x = 121,546,427.19
  5. Step 5: Solve for x
    x = 121,546,427.19/12,405.78
  6. Step 6: Final answer
    x = 9,797.56

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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.