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Finding the Fourth Proportional to 8,708.94, 12,018.24 and 5,172.21

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Solution

The fourth proportional to 8,708.94, 12,018.24 and 5,172.21 is: 7,137.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,708.94 : 12,018.24 = 5,172.21 : x
  2. Step 2: Convert to fraction form
    8,708.94/12,018.24 = 5,172.21/x
  3. Step 3: Cross multiply
    8,708.94x = 12,018.24 × 5,172.21
  4. Step 4: Simplify right side
    8,708.94x = 62,160,861.11
  5. Step 5: Solve for x
    x = 62,160,861.11/8,708.94
  6. Step 6: Final answer
    x = 7,137.59

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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.