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Finding the Fourth Proportional to 1,208.10, 1,809.78 and 1,079.40

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Solution

The fourth proportional to 1,208.10, 1,809.78 and 1,079.40 is: 1,616.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.10 : 1,809.78 = 1,079.40 : x
  2. Step 2: Convert to fraction form
    1,208.10/1,809.78 = 1,079.40/x
  3. Step 3: Cross multiply
    1,208.10x = 1,809.78 × 1,079.40
  4. Step 4: Simplify right side
    1,208.10x = 1,953,476.53
  5. Step 5: Solve for x
    x = 1,953,476.53/1,208.10
  6. Step 6: Final answer
    x = 1,616.98

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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.