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Finding the Fourth Proportional to 1,119.47, 1,678.67 and 339.33

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Solution

The fourth proportional to 1,119.47, 1,678.67 and 339.33 is: 508.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,119.47 : 1,678.67 = 339.33 : x
  2. Step 2: Convert to fraction form
    1,119.47/1,678.67 = 339.33/x
  3. Step 3: Cross multiply
    1,119.47x = 1,678.67 × 339.33
  4. Step 4: Simplify right side
    1,119.47x = 569,623.09
  5. Step 5: Solve for x
    x = 569,623.09/1,119.47
  6. Step 6: Final answer
    x = 508.83

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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.