Home / 5,280.36-7,920.78-1,384.76

Finding the Fourth Proportional to 5,280.36, 7,920.78 and 1,384.76

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Solution

The fourth proportional to 5,280.36, 7,920.78 and 1,384.76 is: 2,077.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,280.36 : 7,920.78 = 1,384.76 : x
  2. Step 2: Convert to fraction form
    5,280.36/7,920.78 = 1,384.76/x
  3. Step 3: Cross multiply
    5,280.36x = 7,920.78 × 1,384.76
  4. Step 4: Simplify right side
    5,280.36x = 10,968,379.31
  5. Step 5: Solve for x
    x = 10,968,379.31/5,280.36
  6. Step 6: Final answer
    x = 2,077.20

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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.