Home / 15,300.78-21,120.39-9,012.75

Finding the Fourth Proportional to 15,300.78, 21,120.39 and 9,012.75

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Solution

The fourth proportional to 15,300.78, 21,120.39 and 9,012.75 is: 12,440.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,300.78 : 21,120.39 = 9,012.75 : x
  2. Step 2: Convert to fraction form
    15,300.78/21,120.39 = 9,012.75/x
  3. Step 3: Cross multiply
    15,300.78x = 21,120.39 × 9,012.75
  4. Step 4: Simplify right side
    15,300.78x = 190,352,794.97
  5. Step 5: Solve for x
    x = 190,352,794.97/15,300.78
  6. Step 6: Final answer
    x = 12,440.72

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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.