Home / 15,354.90-21,189.54-8,640.54

Finding the Fourth Proportional to 15,354.90, 21,189.54 and 8,640.54

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Solution

The fourth proportional to 15,354.90, 21,189.54 and 8,640.54 is: 11,923.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,354.90 : 21,189.54 = 8,640.54 : x
  2. Step 2: Convert to fraction form
    15,354.90/21,189.54 = 8,640.54/x
  3. Step 3: Cross multiply
    15,354.90x = 21,189.54 × 8,640.54
  4. Step 4: Simplify right side
    15,354.90x = 183,089,067.95
  5. Step 5: Solve for x
    x = 183,089,067.95/15,354.90
  6. Step 6: Final answer
    x = 11,923.82

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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.