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Finding the Fourth Proportional to 1,379.60, 1,904.76 and 1,221.02

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Solution

The fourth proportional to 1,379.60, 1,904.76 and 1,221.02 is: 1,685.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.60 : 1,904.76 = 1,221.02 : x
  2. Step 2: Convert to fraction form
    1,379.60/1,904.76 = 1,221.02/x
  3. Step 3: Cross multiply
    1,379.60x = 1,904.76 × 1,221.02
  4. Step 4: Simplify right side
    1,379.60x = 2,325,750.06
  5. Step 5: Solve for x
    x = 2,325,750.06/1,379.60
  6. Step 6: Final answer
    x = 1,685.81

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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.