Home / 2,139.60-2,953.08-1,393.68

Finding the Fourth Proportional to 2,139.60, 2,953.08 and 1,393.68

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Solution

The fourth proportional to 2,139.60, 2,953.08 and 1,393.68 is: 1,923.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,139.60 : 2,953.08 = 1,393.68 : x
  2. Step 2: Convert to fraction form
    2,139.60/2,953.08 = 1,393.68/x
  3. Step 3: Cross multiply
    2,139.60x = 2,953.08 × 1,393.68
  4. Step 4: Simplify right side
    2,139.60x = 4,115,648.53
  5. Step 5: Solve for x
    x = 4,115,648.53/2,139.60
  6. Step 6: Final answer
    x = 1,923.56

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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.