Home / 1,515.15-2,090.79-851.87

Finding the Fourth Proportional to 1,515.15, 2,090.79 and 851.87

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Solution

The fourth proportional to 1,515.15, 2,090.79 and 851.87 is: 1,175.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,515.15 : 2,090.79 = 851.87 : x
  2. Step 2: Convert to fraction form
    1,515.15/2,090.79 = 851.87/x
  3. Step 3: Cross multiply
    1,515.15x = 2,090.79 × 851.87
  4. Step 4: Simplify right side
    1,515.15x = 1,781,081.28
  5. Step 5: Solve for x
    x = 1,781,081.28/1,515.15
  6. Step 6: Final answer
    x = 1,175.51

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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.