Home / 2,688.36-4,031.68-1,389.64

Finding the Fourth Proportional to 2,688.36, 4,031.68 and 1,389.64

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Solution

The fourth proportional to 2,688.36, 4,031.68 and 1,389.64 is: 2,084.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,688.36 : 4,031.68 = 1,389.64 : x
  2. Step 2: Convert to fraction form
    2,688.36/4,031.68 = 1,389.64/x
  3. Step 3: Cross multiply
    2,688.36x = 4,031.68 × 1,389.64
  4. Step 4: Simplify right side
    2,688.36x = 5,602,583.80
  5. Step 5: Solve for x
    x = 5,602,583.80/2,688.36
  6. Step 6: Final answer
    x = 2,084.02

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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.