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Finding the Fourth Proportional to 1,308.45, 1,805.78 and 719.11

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Solution

The fourth proportional to 1,308.45, 1,805.78 and 719.11 is: 992.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.45 : 1,805.78 = 719.11 : x
  2. Step 2: Convert to fraction form
    1,308.45/1,805.78 = 719.11/x
  3. Step 3: Cross multiply
    1,308.45x = 1,805.78 × 719.11
  4. Step 4: Simplify right side
    1,308.45x = 1,298,554.47
  5. Step 5: Solve for x
    x = 1,298,554.47/1,308.45
  6. Step 6: Final answer
    x = 992.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.