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Finding the Fourth Proportional to 1,308.90, 1,806.31 and 719.49

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Solution

The fourth proportional to 1,308.90, 1,806.31 and 719.49 is: 992.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.90 : 1,806.31 = 719.49 : x
  2. Step 2: Convert to fraction form
    1,308.90/1,806.31 = 719.49/x
  3. Step 3: Cross multiply
    1,308.90x = 1,806.31 × 719.49
  4. Step 4: Simplify right side
    1,308.90x = 1,299,621.98
  5. Step 5: Solve for x
    x = 1,299,621.98/1,308.90
  6. Step 6: Final answer
    x = 992.91

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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.