Home / 1,515.81-2,090.57-1,280.31

Finding the Fourth Proportional to 1,515.81, 2,090.57 and 1,280.31

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Solution

The fourth proportional to 1,515.81, 2,090.57 and 1,280.31 is: 1,765.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,515.81 : 2,090.57 = 1,280.31 : x
  2. Step 2: Convert to fraction form
    1,515.81/2,090.57 = 1,280.31/x
  3. Step 3: Cross multiply
    1,515.81x = 2,090.57 × 1,280.31
  4. Step 4: Simplify right side
    1,515.81x = 2,676,571.28
  5. Step 5: Solve for x
    x = 2,676,571.28/1,515.81
  6. Step 6: Final answer
    x = 1,765.77

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1.5x scale

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.