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Finding the Fourth Proportional to 1,308.48, 1,805.81 and 719.13

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Solution

The fourth proportional to 1,308.48, 1,805.81 and 719.13 is: 992.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.48 : 1,805.81 = 719.13 : x
  2. Step 2: Convert to fraction form
    1,308.48/1,805.81 = 719.13/x
  3. Step 3: Cross multiply
    1,308.48x = 1,805.81 × 719.13
  4. Step 4: Simplify right side
    1,308.48x = 1,298,612.15
  5. Step 5: Solve for x
    x = 1,298,612.15/1,308.48
  6. Step 6: Final answer
    x = 992.46

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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.