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Finding the Fourth Proportional to 1,390.08, 2,079.90 and 832.74

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Solution

The fourth proportional to 1,390.08, 2,079.90 and 832.74 is: 1,245.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.08 : 2,079.90 = 832.74 : x
  2. Step 2: Convert to fraction form
    1,390.08/2,079.90 = 832.74/x
  3. Step 3: Cross multiply
    1,390.08x = 2,079.90 × 832.74
  4. Step 4: Simplify right side
    1,390.08x = 1,732,015.93
  5. Step 5: Solve for x
    x = 1,732,015.93/1,390.08
  6. Step 6: Final answer
    x = 1,245.98

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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.