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Finding the Fourth Proportional to 9,406.06, 12,979.90 and 5,428.44

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Solution

The fourth proportional to 9,406.06, 12,979.90 and 5,428.44 is: 7,490.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,406.06 : 12,979.90 = 5,428.44 : x
  2. Step 2: Convert to fraction form
    9,406.06/12,979.90 = 5,428.44/x
  3. Step 3: Cross multiply
    9,406.06x = 12,979.90 × 5,428.44
  4. Step 4: Simplify right side
    9,406.06x = 70,460,608.36
  5. Step 5: Solve for x
    x = 70,460,608.36/9,406.06
  6. Step 6: Final answer
    x = 7,490.98

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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.