Home / 21,030.12-31,541.22-7,879.68

Finding the Fourth Proportional to 21,030.12, 31,541.22 and 7,879.68

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Solution

The fourth proportional to 21,030.12, 31,541.22 and 7,879.68 is: 11,818.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,030.12 : 31,541.22 = 7,879.68 : x
  2. Step 2: Convert to fraction form
    21,030.12/31,541.22 = 7,879.68/x
  3. Step 3: Cross multiply
    21,030.12x = 31,541.22 × 7,879.68
  4. Step 4: Simplify right side
    21,030.12x = 248,534,720.41
  5. Step 5: Solve for x
    x = 248,534,720.41/21,030.12
  6. Step 6: Final answer
    x = 11,818.04

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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.