Home / 1,391.36-2,088.05-1,120.72

Finding the Fourth Proportional to 1,391.36, 2,088.05 and 1,120.72

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Solution

The fourth proportional to 1,391.36, 2,088.05 and 1,120.72 is: 1,681.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.36 : 2,088.05 = 1,120.72 : x
  2. Step 2: Convert to fraction form
    1,391.36/2,088.05 = 1,120.72/x
  3. Step 3: Cross multiply
    1,391.36x = 2,088.05 × 1,120.72
  4. Step 4: Simplify right side
    1,391.36x = 2,340,114.18
  5. Step 5: Solve for x
    x = 2,340,114.18/1,391.36
  6. Step 6: Final answer
    x = 1,681.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.