Home / 2,688.90-4,030.88-1,387.64

Finding the Fourth Proportional to 2,688.90, 4,030.88 and 1,387.64

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Solution

The fourth proportional to 2,688.90, 4,030.88 and 1,387.64 is: 2,080.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,688.90 : 4,030.88 = 1,387.64 : x
  2. Step 2: Convert to fraction form
    2,688.90/4,030.88 = 1,387.64/x
  3. Step 3: Cross multiply
    2,688.90x = 4,030.88 × 1,387.64
  4. Step 4: Simplify right side
    2,688.90x = 5,593,410.32
  5. Step 5: Solve for x
    x = 5,593,410.32/2,688.90
  6. Step 6: Final answer
    x = 2,080.19

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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.