Home / 21,120.41-31,690.00-11,122.72

Finding the Fourth Proportional to 21,120.41, 31,690.00 and 11,122.72

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Solution

The fourth proportional to 21,120.41, 31,690.00 and 11,122.72 is: 16,689.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,120.41 : 31,690.00 = 11,122.72 : x
  2. Step 2: Convert to fraction form
    21,120.41/31,690.00 = 11,122.72/x
  3. Step 3: Cross multiply
    21,120.41x = 31,690.00 × 11,122.72
  4. Step 4: Simplify right side
    21,120.41x = 352,478,931.48
  5. Step 5: Solve for x
    x = 352,478,931.48/21,120.41
  6. Step 6: Final answer
    x = 16,689.02

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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.