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Finding the Fourth Proportional to 1,420.88, 2,129.31 and 1,069.25

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Solution

The fourth proportional to 1,420.88, 2,129.31 and 1,069.25 is: 1,602.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.88 : 2,129.31 = 1,069.25 : x
  2. Step 2: Convert to fraction form
    1,420.88/2,129.31 = 1,069.25/x
  3. Step 3: Cross multiply
    1,420.88x = 2,129.31 × 1,069.25
  4. Step 4: Simplify right side
    1,420.88x = 2,276,755.55
  5. Step 5: Solve for x
    x = 2,276,755.55/1,420.88
  6. Step 6: Final answer
    x = 1,602.36

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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.