Home / 2,115.81-2,919.51-1,330.11

Finding the Fourth Proportional to 2,115.81, 2,919.51 and 1,330.11

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Solution

The fourth proportional to 2,115.81, 2,919.51 and 1,330.11 is: 1,835.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.81 : 2,919.51 = 1,330.11 : x
  2. Step 2: Convert to fraction form
    2,115.81/2,919.51 = 1,330.11/x
  3. Step 3: Cross multiply
    2,115.81x = 2,919.51 × 1,330.11
  4. Step 4: Simplify right side
    2,115.81x = 3,883,269.45
  5. Step 5: Solve for x
    x = 3,883,269.45/2,115.81
  6. Step 6: Final answer
    x = 1,835.36

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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.