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Finding the Fourth Proportional to 1,208.04, 1,813.80 and 689.04

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Solution

The fourth proportional to 1,208.04, 1,813.80 and 689.04 is: 1,034.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.04 : 1,813.80 = 689.04 : x
  2. Step 2: Convert to fraction form
    1,208.04/1,813.80 = 689.04/x
  3. Step 3: Cross multiply
    1,208.04x = 1,813.80 × 689.04
  4. Step 4: Simplify right side
    1,208.04x = 1,249,780.75
  5. Step 5: Solve for x
    x = 1,249,780.75/1,208.04
  6. Step 6: Final answer
    x = 1,034.55

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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.