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Finding the Fourth Proportional to 1,438.11, 1,984.55 and 808.65

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Solution

The fourth proportional to 1,438.11, 1,984.55 and 808.65 is: 1,115.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.11 : 1,984.55 = 808.65 : x
  2. Step 2: Convert to fraction form
    1,438.11/1,984.55 = 808.65/x
  3. Step 3: Cross multiply
    1,438.11x = 1,984.55 × 808.65
  4. Step 4: Simplify right side
    1,438.11x = 1,604,802.31
  5. Step 5: Solve for x
    x = 1,604,802.31/1,438.11
  6. Step 6: Final answer
    x = 1,115.91

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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.