Home / 8,721-12,018.18-5,571.72

Finding the Fourth Proportional to 8,721, 12,018.18 and 5,571.72

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Solution

The fourth proportional to 8,721, 12,018.18 and 5,571.72 is: 7,678.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,721 : 12,018.18 = 5,571.72 : x
  2. Step 2: Convert to fraction form
    8,721/12,018.18 = 5,571.72/x
  3. Step 3: Cross multiply
    8,721x = 12,018.18 × 5,571.72
  4. Step 4: Simplify right side
    8,721x = 66,961,933.87
  5. Step 5: Solve for x
    x = 66,961,933.87/8,721
  6. Step 6: Final answer
    x = 7,678.24

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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.