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Finding the Fourth Proportional to 15,013.56, 20,718.72 and 8,389.56

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Solution

The fourth proportional to 15,013.56, 20,718.72 and 8,389.56 is: 11,577.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,013.56 : 20,718.72 = 8,389.56 : x
  2. Step 2: Convert to fraction form
    15,013.56/20,718.72 = 8,389.56/x
  3. Step 3: Cross multiply
    15,013.56x = 20,718.72 × 8,389.56
  4. Step 4: Simplify right side
    15,013.56x = 173,820,944.56
  5. Step 5: Solve for x
    x = 173,820,944.56/15,013.56
  6. Step 6: Final answer
    x = 11,577.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.