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Finding the Fourth Proportional to 1,109.34, 1,663.41 and 339.74

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Solution

The fourth proportional to 1,109.34, 1,663.41 and 339.74 is: 509.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.34 : 1,663.41 = 339.74 : x
  2. Step 2: Convert to fraction form
    1,109.34/1,663.41 = 339.74/x
  3. Step 3: Cross multiply
    1,109.34x = 1,663.41 × 339.74
  4. Step 4: Simplify right side
    1,109.34x = 565,126.91
  5. Step 5: Solve for x
    x = 565,126.91/1,109.34
  6. Step 6: Final answer
    x = 509.43

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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.