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Finding the Fourth Proportional to 1,978.07, 2,966.49 and 808.38

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Solution

The fourth proportional to 1,978.07, 2,966.49 and 808.38 is: 1,212.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,978.07 : 2,966.49 = 808.38 : x
  2. Step 2: Convert to fraction form
    1,978.07/2,966.49 = 808.38/x
  3. Step 3: Cross multiply
    1,978.07x = 2,966.49 × 808.38
  4. Step 4: Simplify right side
    1,978.07x = 2,398,051.19
  5. Step 5: Solve for x
    x = 2,398,051.19/1,978.07
  6. Step 6: Final answer
    x = 1,212.32

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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.