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Finding the Fourth Proportional to 1,428.11, 1,970.34 and 798.55

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Solution

The fourth proportional to 1,428.11, 1,970.34 and 798.55 is: 1,101.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.11 : 1,970.34 = 798.55 : x
  2. Step 2: Convert to fraction form
    1,428.11/1,970.34 = 798.55/x
  3. Step 3: Cross multiply
    1,428.11x = 1,970.34 × 798.55
  4. Step 4: Simplify right side
    1,428.11x = 1,573,415.01
  5. Step 5: Solve for x
    x = 1,573,415.01/1,428.11
  6. Step 6: Final answer
    x = 1,101.75

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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.