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Finding the Fourth Proportional to 21,270.56, 31,920.12 and 8,790.56

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Solution

The fourth proportional to 21,270.56, 31,920.12 and 8,790.56 is: 13,191.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,270.56 : 31,920.12 = 8,790.56 : x
  2. Step 2: Convert to fraction form
    21,270.56/31,920.12 = 8,790.56/x
  3. Step 3: Cross multiply
    21,270.56x = 31,920.12 × 8,790.56
  4. Step 4: Simplify right side
    21,270.56x = 280,595,730.07
  5. Step 5: Solve for x
    x = 280,595,730.07/21,270.56
  6. Step 6: Final answer
    x = 13,191.74

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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.