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Finding the Fourth Proportional to 1,438.16, 1,984.50 and 808.61

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Solution

The fourth proportional to 1,438.16, 1,984.50 and 808.61 is: 1,115.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.16 : 1,984.50 = 808.61 : x
  2. Step 2: Convert to fraction form
    1,438.16/1,984.50 = 808.61/x
  3. Step 3: Cross multiply
    1,438.16x = 1,984.50 × 808.61
  4. Step 4: Simplify right side
    1,438.16x = 1,604,676.62
  5. Step 5: Solve for x
    x = 1,604,676.62/1,438.16
  6. Step 6: Final answer
    x = 1,115.79

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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.