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Finding the Fourth Proportional to 1,308.05, 1,961.16 and 814.15

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Solution

The fourth proportional to 1,308.05, 1,961.16 and 814.15 is: 1,220.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.05 : 1,961.16 = 814.15 : x
  2. Step 2: Convert to fraction form
    1,308.05/1,961.16 = 814.15/x
  3. Step 3: Cross multiply
    1,308.05x = 1,961.16 × 814.15
  4. Step 4: Simplify right side
    1,308.05x = 1,596,670.46
  5. Step 5: Solve for x
    x = 1,596,670.46/1,308.05
  6. Step 6: Final answer
    x = 1,220.65

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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.