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Finding the Fourth Proportional to 1,339.78, 2,009.51 and 365.81

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Solution

The fourth proportional to 1,339.78, 2,009.51 and 365.81 is: 548.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,339.78 : 2,009.51 = 365.81 : x
  2. Step 2: Convert to fraction form
    1,339.78/2,009.51 = 365.81/x
  3. Step 3: Cross multiply
    1,339.78x = 2,009.51 × 365.81
  4. Step 4: Simplify right side
    1,339.78x = 735,086.98
  5. Step 5: Solve for x
    x = 735,086.98/1,339.78
  6. Step 6: Final answer
    x = 548.66

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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.