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Finding the Fourth Proportional to 1,205.45, 1,808.51 and 415.00

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Solution

The fourth proportional to 1,205.45, 1,808.51 and 415.00 is: 622.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.45 : 1,808.51 = 415.00 : x
  2. Step 2: Convert to fraction form
    1,205.45/1,808.51 = 415.00/x
  3. Step 3: Cross multiply
    1,205.45x = 1,808.51 × 415.00
  4. Step 4: Simplify right side
    1,205.45x = 750,528.17
  5. Step 5: Solve for x
    x = 750,528.17/1,205.45
  6. Step 6: Final answer
    x = 622.62

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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.