Home / 2,160-2,979.72-1,571.40

Finding the Fourth Proportional to 2,160, 2,979.72 and 1,571.40

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Solution

The fourth proportional to 2,160, 2,979.72 and 1,571.40 is: 2,167.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,160 : 2,979.72 = 1,571.40 : x
  2. Step 2: Convert to fraction form
    2,160/2,979.72 = 1,571.40/x
  3. Step 3: Cross multiply
    2,160x = 2,979.72 × 1,571.40
  4. Step 4: Simplify right side
    2,160x = 4,682,332.01
  5. Step 5: Solve for x
    x = 4,682,332.01/2,160
  6. Step 6: Final answer
    x = 2,167.75

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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.