Home / 3,618.47-5,428.62-1,278.38

Finding the Fourth Proportional to 3,618.47, 5,428.62 and 1,278.38

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Solution

The fourth proportional to 3,618.47, 5,428.62 and 1,278.38 is: 1,917.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,618.47 : 5,428.62 = 1,278.38 : x
  2. Step 2: Convert to fraction form
    3,618.47/5,428.62 = 1,278.38/x
  3. Step 3: Cross multiply
    3,618.47x = 5,428.62 × 1,278.38
  4. Step 4: Simplify right side
    3,618.47x = 6,939,852.81
  5. Step 5: Solve for x
    x = 6,939,852.81/3,618.47
  6. Step 6: Final answer
    x = 1,917.90

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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.