Home / 2,115.10-2,918.87-1,170.91

Finding the Fourth Proportional to 2,115.10, 2,918.87 and 1,170.91

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Solution

The fourth proportional to 2,115.10, 2,918.87 and 1,170.91 is: 1,615.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.10 : 2,918.87 = 1,170.91 : x
  2. Step 2: Convert to fraction form
    2,115.10/2,918.87 = 1,170.91/x
  3. Step 3: Cross multiply
    2,115.10x = 2,918.87 × 1,170.91
  4. Step 4: Simplify right side
    2,115.10x = 3,417,734.07
  5. Step 5: Solve for x
    x = 3,417,734.07/2,115.10
  6. Step 6: Final answer
    x = 1,615.87

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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.