Home / 21,018.60-31,508.40-7,879.56

Finding the Fourth Proportional to 21,018.60, 31,508.40 and 7,879.56

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Solution

The fourth proportional to 21,018.60, 31,508.40 and 7,879.56 is: 11,812.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,018.60 : 31,508.40 = 7,879.56 : x
  2. Step 2: Convert to fraction form
    21,018.60/31,508.40 = 7,879.56/x
  3. Step 3: Cross multiply
    21,018.60x = 31,508.40 × 7,879.56
  4. Step 4: Simplify right side
    21,018.60x = 248,272,328.30
  5. Step 5: Solve for x
    x = 248,272,328.30/21,018.60
  6. Step 6: Final answer
    x = 11,812.03

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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.