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Finding the Fourth Proportional to 1,205.03, 1,806.90 and 555.19

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Solution

The fourth proportional to 1,205.03, 1,806.90 and 555.19 is: 832.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.03 : 1,806.90 = 555.19 : x
  2. Step 2: Convert to fraction form
    1,205.03/1,806.90 = 555.19/x
  3. Step 3: Cross multiply
    1,205.03x = 1,806.90 × 555.19
  4. Step 4: Simplify right side
    1,205.03x = 1,003,166.21
  5. Step 5: Solve for x
    x = 1,003,166.21/1,205.03
  6. Step 6: Final answer
    x = 832.48

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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.