Home / 1,391.40-2,088.14-1,120.77

Finding the Fourth Proportional to 1,391.40, 2,088.14 and 1,120.77

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Solution

The fourth proportional to 1,391.40, 2,088.14 and 1,120.77 is: 1,681.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.40 : 2,088.14 = 1,120.77 : x
  2. Step 2: Convert to fraction form
    1,391.40/2,088.14 = 1,120.77/x
  3. Step 3: Cross multiply
    1,391.40x = 2,088.14 × 1,120.77
  4. Step 4: Simplify right side
    1,391.40x = 2,340,319.06
  5. Step 5: Solve for x
    x = 2,340,319.06/1,391.40
  6. Step 6: Final answer
    x = 1,681.99

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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.