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Finding the Fourth Proportional to 1,308.03, 1,805.13 and 783.96

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Solution

The fourth proportional to 1,308.03, 1,805.13 and 783.96 is: 1,081.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.03 : 1,805.13 = 783.96 : x
  2. Step 2: Convert to fraction form
    1,308.03/1,805.13 = 783.96/x
  3. Step 3: Cross multiply
    1,308.03x = 1,805.13 × 783.96
  4. Step 4: Simplify right side
    1,308.03x = 1,415,149.71
  5. Step 5: Solve for x
    x = 1,415,149.71/1,308.03
  6. Step 6: Final answer
    x = 1,081.89

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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.