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Finding the Fourth Proportional to 3,852.70, 5,779.14 and 1,387.72

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Solution

The fourth proportional to 3,852.70, 5,779.14 and 1,387.72 is: 2,081.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,852.70 : 5,779.14 = 1,387.72 : x
  2. Step 2: Convert to fraction form
    3,852.70/5,779.14 = 1,387.72/x
  3. Step 3: Cross multiply
    3,852.70x = 5,779.14 × 1,387.72
  4. Step 4: Simplify right side
    3,852.70x = 8,019,828.16
  5. Step 5: Solve for x
    x = 8,019,828.16/3,852.70
  6. Step 6: Final answer
    x = 2,081.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.