Home / 21,276.30-31,916.64-8,139.72

Finding the Fourth Proportional to 21,276.30, 31,916.64 and 8,139.72

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Solution

The fourth proportional to 21,276.30, 31,916.64 and 8,139.72 is: 12,210.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,276.30 : 31,916.64 = 8,139.72 : x
  2. Step 2: Convert to fraction form
    21,276.30/31,916.64 = 8,139.72/x
  3. Step 3: Cross multiply
    21,276.30x = 31,916.64 × 8,139.72
  4. Step 4: Simplify right side
    21,276.30x = 259,792,512.94
  5. Step 5: Solve for x
    x = 259,792,512.94/21,276.30
  6. Step 6: Final answer
    x = 12,210.42

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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.