Home / 2,130.39-2,939.79-1,186.20

Finding the Fourth Proportional to 2,130.39, 2,939.79 and 1,186.20

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Solution

The fourth proportional to 2,130.39, 2,939.79 and 1,186.20 is: 1,636.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,130.39 : 2,939.79 = 1,186.20 : x
  2. Step 2: Convert to fraction form
    2,130.39/2,939.79 = 1,186.20/x
  3. Step 3: Cross multiply
    2,130.39x = 2,939.79 × 1,186.20
  4. Step 4: Simplify right side
    2,130.39x = 3,487,178.90
  5. Step 5: Solve for x
    x = 3,487,178.90/2,130.39
  6. Step 6: Final answer
    x = 1,636.87

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1.5x scale

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.