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Finding the Fourth Proportional to 3,886.70, 5,830.06 and 1,421.54

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Solution

The fourth proportional to 3,886.70, 5,830.06 and 1,421.54 is: 2,132.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,886.70 : 5,830.06 = 1,421.54 : x
  2. Step 2: Convert to fraction form
    3,886.70/5,830.06 = 1,421.54/x
  3. Step 3: Cross multiply
    3,886.70x = 5,830.06 × 1,421.54
  4. Step 4: Simplify right side
    3,886.70x = 8,287,663.49
  5. Step 5: Solve for x
    x = 8,287,663.49/3,886.70
  6. Step 6: Final answer
    x = 2,132.31

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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.