Home / 1,431.36-2,147.16-391.37

Finding the Fourth Proportional to 1,431.36, 2,147.16 and 391.37

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Solution

The fourth proportional to 1,431.36, 2,147.16 and 391.37 is: 587.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.36 : 2,147.16 = 391.37 : x
  2. Step 2: Convert to fraction form
    1,431.36/2,147.16 = 391.37/x
  3. Step 3: Cross multiply
    1,431.36x = 2,147.16 × 391.37
  4. Step 4: Simplify right side
    1,431.36x = 840,325.02
  5. Step 5: Solve for x
    x = 840,325.02/1,431.36
  6. Step 6: Final answer
    x = 587.08

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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.