Home / 1,515.19-2,090.21-1,315.75

Finding the Fourth Proportional to 1,515.19, 2,090.21 and 1,315.75

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Solution

The fourth proportional to 1,515.19, 2,090.21 and 1,315.75 is: 1,815.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,515.19 : 2,090.21 = 1,315.75 : x
  2. Step 2: Convert to fraction form
    1,515.19/2,090.21 = 1,315.75/x
  3. Step 3: Cross multiply
    1,515.19x = 2,090.21 × 1,315.75
  4. Step 4: Simplify right side
    1,515.19x = 2,750,193.81
  5. Step 5: Solve for x
    x = 2,750,193.81/1,515.19
  6. Step 6: Final answer
    x = 1,815.08

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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.