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Finding the Fourth Proportional to 2,156.51, 3,232.50 and 839.90

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Solution

The fourth proportional to 2,156.51, 3,232.50 and 839.90 is: 1,258.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,156.51 : 3,232.50 = 839.90 : x
  2. Step 2: Convert to fraction form
    2,156.51/3,232.50 = 839.90/x
  3. Step 3: Cross multiply
    2,156.51x = 3,232.50 × 839.90
  4. Step 4: Simplify right side
    2,156.51x = 2,714,960.59
  5. Step 5: Solve for x
    x = 2,714,960.59/2,156.51
  6. Step 6: Final answer
    x = 1,258.96

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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.