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Finding the Fourth Proportional to 8,690.79, 11,995.39 and 5,106.54

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Solution

The fourth proportional to 8,690.79, 11,995.39 and 5,106.54 is: 7,048.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,690.79 : 11,995.39 = 5,106.54 : x
  2. Step 2: Convert to fraction form
    8,690.79/11,995.39 = 5,106.54/x
  3. Step 3: Cross multiply
    8,690.79x = 11,995.39 × 5,106.54
  4. Step 4: Simplify right side
    8,690.79x = 61,254,990.22
  5. Step 5: Solve for x
    x = 61,254,990.22/8,690.79
  6. Step 6: Final answer
    x = 7,048.26

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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.