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Finding the Fourth Proportional to 1,201.86, 1,802.79 and 380.07

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Solution

The fourth proportional to 1,201.86, 1,802.79 and 380.07 is: 570.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,201.86 : 1,802.79 = 380.07 : x
  2. Step 2: Convert to fraction form
    1,201.86/1,802.79 = 380.07/x
  3. Step 3: Cross multiply
    1,201.86x = 1,802.79 × 380.07
  4. Step 4: Simplify right side
    1,201.86x = 685,186.40
  5. Step 5: Solve for x
    x = 685,186.40/1,201.86
  6. Step 6: Final answer
    x = 570.11

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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.