Home / 3,128.78-4,316.87-1,869.28

Finding the Fourth Proportional to 3,128.78, 4,316.87 and 1,869.28

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Solution

The fourth proportional to 3,128.78, 4,316.87 and 1,869.28 is: 2,579.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,128.78 : 4,316.87 = 1,869.28 : x
  2. Step 2: Convert to fraction form
    3,128.78/4,316.87 = 1,869.28/x
  3. Step 3: Cross multiply
    3,128.78x = 4,316.87 × 1,869.28
  4. Step 4: Simplify right side
    3,128.78x = 8,069,438.75
  5. Step 5: Solve for x
    x = 8,069,438.75/3,128.78
  6. Step 6: Final answer
    x = 2,579.10

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.