Home / 5,281.20-7,921.26-1,385.64

Finding the Fourth Proportional to 5,281.20, 7,921.26 and 1,385.64

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Solution

The fourth proportional to 5,281.20, 7,921.26 and 1,385.64 is: 2,078.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,281.20 : 7,921.26 = 1,385.64 : x
  2. Step 2: Convert to fraction form
    5,281.20/7,921.26 = 1,385.64/x
  3. Step 3: Cross multiply
    5,281.20x = 7,921.26 × 1,385.64
  4. Step 4: Simplify right side
    5,281.20x = 10,976,014.71
  5. Step 5: Solve for x
    x = 10,976,014.71/5,281.20
  6. Step 6: Final answer
    x = 2,078.32

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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.