Home / 13,121.60-19,678.80-5,331.20

Finding the Fourth Proportional to 13,121.60, 19,678.80 and 5,331.20

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Solution

The fourth proportional to 13,121.60, 19,678.80 and 5,331.20 is: 7,995.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,121.60 : 19,678.80 = 5,331.20 : x
  2. Step 2: Convert to fraction form
    13,121.60/19,678.80 = 5,331.20/x
  3. Step 3: Cross multiply
    13,121.60x = 19,678.80 × 5,331.20
  4. Step 4: Simplify right side
    13,121.60x = 104,911,618.56
  5. Step 5: Solve for x
    x = 104,911,618.56/13,121.60
  6. Step 6: Final answer
    x = 7,995.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.