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Finding the Fourth Proportional to 1,428.39, 1,971.22 and 798.90

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Solution

The fourth proportional to 1,428.39, 1,971.22 and 798.90 is: 1,102.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.39 : 1,971.22 = 798.90 : x
  2. Step 2: Convert to fraction form
    1,428.39/1,971.22 = 798.90/x
  3. Step 3: Cross multiply
    1,428.39x = 1,971.22 × 798.90
  4. Step 4: Simplify right side
    1,428.39x = 1,574,807.66
  5. Step 5: Solve for x
    x = 1,574,807.66/1,428.39
  6. Step 6: Final answer
    x = 1,102.51

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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.