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Finding the Fourth Proportional to 7,018.70, 9,685.80 and 3,874.88

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Solution

The fourth proportional to 7,018.70, 9,685.80 and 3,874.88 is: 5,347.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,018.70 : 9,685.80 = 3,874.88 : x
  2. Step 2: Convert to fraction form
    7,018.70/9,685.80 = 3,874.88/x
  3. Step 3: Cross multiply
    7,018.70x = 9,685.80 × 3,874.88
  4. Step 4: Simplify right side
    7,018.70x = 37,531,312.70
  5. Step 5: Solve for x
    x = 37,531,312.70/7,018.70
  6. Step 6: Final answer
    x = 5,347.33

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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.