Home / 3,918.32-5,877.60-1,320.80

Finding the Fourth Proportional to 3,918.32, 5,877.60 and 1,320.80

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Solution

The fourth proportional to 3,918.32, 5,877.60 and 1,320.80 is: 1,981.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,918.32 : 5,877.60 = 1,320.80 : x
  2. Step 2: Convert to fraction form
    3,918.32/5,877.60 = 1,320.80/x
  3. Step 3: Cross multiply
    3,918.32x = 5,877.60 × 1,320.80
  4. Step 4: Simplify right side
    3,918.32x = 7,763,134.08
  5. Step 5: Solve for x
    x = 7,763,134.08/3,918.32
  6. Step 6: Final answer
    x = 1,981.24

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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.