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Finding the Fourth Proportional to 2,160.84, 3,239.10 and 991.20

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Solution

The fourth proportional to 2,160.84, 3,239.10 and 991.20 is: 1,485.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,160.84 : 3,239.10 = 991.20 : x
  2. Step 2: Convert to fraction form
    2,160.84/3,239.10 = 991.20/x
  3. Step 3: Cross multiply
    2,160.84x = 3,239.10 × 991.20
  4. Step 4: Simplify right side
    2,160.84x = 3,210,595.92
  5. Step 5: Solve for x
    x = 3,210,595.92/2,160.84
  6. Step 6: Final answer
    x = 1,485.81

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1.5x scale

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.