Home / 1,393.29-2,087.10-1,187.55

Finding the Fourth Proportional to 1,393.29, 2,087.10 and 1,187.55

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Solution

The fourth proportional to 1,393.29, 2,087.10 and 1,187.55 is: 1,778.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.29 : 2,087.10 = 1,187.55 : x
  2. Step 2: Convert to fraction form
    1,393.29/2,087.10 = 1,187.55/x
  3. Step 3: Cross multiply
    1,393.29x = 2,087.10 × 1,187.55
  4. Step 4: Simplify right side
    1,393.29x = 2,478,535.61
  5. Step 5: Solve for x
    x = 2,478,535.61/1,393.29
  6. Step 6: Final answer
    x = 1,778.91

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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.