Home / 5,280.20-7,920.80-1,384.64

Finding the Fourth Proportional to 5,280.20, 7,920.80 and 1,384.64

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Solution

The fourth proportional to 5,280.20, 7,920.80 and 1,384.64 is: 2,077.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,280.20 : 7,920.80 = 1,384.64 : x
  2. Step 2: Convert to fraction form
    5,280.20/7,920.80 = 1,384.64/x
  3. Step 3: Cross multiply
    5,280.20x = 7,920.80 × 1,384.64
  4. Step 4: Simplify right side
    5,280.20x = 10,967,456.51
  5. Step 5: Solve for x
    x = 10,967,456.51/5,280.20
  6. Step 6: Final answer
    x = 2,077.09

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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.