Home / 1,538.10-2,107.79-1,390.48

Finding the Fourth Proportional to 1,538.10, 2,107.79 and 1,390.48

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Solution

The fourth proportional to 1,538.10, 2,107.79 and 1,390.48 is: 1,905.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,538.10 : 2,107.79 = 1,390.48 : x
  2. Step 2: Convert to fraction form
    1,538.10/2,107.79 = 1,390.48/x
  3. Step 3: Cross multiply
    1,538.10x = 2,107.79 × 1,390.48
  4. Step 4: Simplify right side
    1,538.10x = 2,930,839.84
  5. Step 5: Solve for x
    x = 2,930,839.84/1,538.10
  6. Step 6: Final answer
    x = 1,905.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.