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Finding the Fourth Proportional to 4,269.80, 6,405.40 and 1,347.40

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Solution

The fourth proportional to 4,269.80, 6,405.40 and 1,347.40 is: 2,021.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,269.80 : 6,405.40 = 1,347.40 : x
  2. Step 2: Convert to fraction form
    4,269.80/6,405.40 = 1,347.40/x
  3. Step 3: Cross multiply
    4,269.80x = 6,405.40 × 1,347.40
  4. Step 4: Simplify right side
    4,269.80x = 8,630,635.96
  5. Step 5: Solve for x
    x = 8,630,635.96/4,269.80
  6. Step 6: Final answer
    x = 2,021.32

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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.