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Finding the Fourth Proportional to 1,209.77, 1,809.57 and 1,019.62

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Solution

The fourth proportional to 1,209.77, 1,809.57 and 1,019.62 is: 1,525.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.77 : 1,809.57 = 1,019.62 : x
  2. Step 2: Convert to fraction form
    1,209.77/1,809.57 = 1,019.62/x
  3. Step 3: Cross multiply
    1,209.77x = 1,809.57 × 1,019.62
  4. Step 4: Simplify right side
    1,209.77x = 1,845,079.85
  5. Step 5: Solve for x
    x = 1,845,079.85/1,209.77
  6. Step 6: Final answer
    x = 1,525.15

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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.