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Finding the Fourth Proportional to 3,885.35, 5,326.79 and 3,815.40

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Solution

The fourth proportional to 3,885.35, 5,326.79 and 3,815.40 is: 5,230.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,885.35 : 5,326.79 = 3,815.40 : x
  2. Step 2: Convert to fraction form
    3,885.35/5,326.79 = 3,815.40/x
  3. Step 3: Cross multiply
    3,885.35x = 5,326.79 × 3,815.40
  4. Step 4: Simplify right side
    3,885.35x = 20,323,815.49
  5. Step 5: Solve for x
    x = 20,323,815.49/3,885.35
  6. Step 6: Final answer
    x = 5,230.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.