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Finding the Fourth Proportional to 2,139.46, 3,209.02 and 840.93

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Solution

The fourth proportional to 2,139.46, 3,209.02 and 840.93 is: 1,261.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,139.46 : 3,209.02 = 840.93 : x
  2. Step 2: Convert to fraction form
    2,139.46/3,209.02 = 840.93/x
  3. Step 3: Cross multiply
    2,139.46x = 3,209.02 × 840.93
  4. Step 4: Simplify right side
    2,139.46x = 2,698,565.10
  5. Step 5: Solve for x
    x = 2,698,565.10/2,139.46
  6. Step 6: Final answer
    x = 1,261.33

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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.