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Finding the Fourth Proportional to 1,209.88, 1,814.94 and 479.80

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Solution

The fourth proportional to 1,209.88, 1,814.94 and 479.80 is: 719.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.88 : 1,814.94 = 479.80 : x
  2. Step 2: Convert to fraction form
    1,209.88/1,814.94 = 479.80/x
  3. Step 3: Cross multiply
    1,209.88x = 1,814.94 × 479.80
  4. Step 4: Simplify right side
    1,209.88x = 870,808.21
  5. Step 5: Solve for x
    x = 870,808.21/1,209.88
  6. Step 6: Final answer
    x = 719.75

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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.