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Finding the Fourth Proportional to 1,129.15, 1,693.72 and 744.31

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Solution

The fourth proportional to 1,129.15, 1,693.72 and 744.31 is: 1,116.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.15 : 1,693.72 = 744.31 : x
  2. Step 2: Convert to fraction form
    1,129.15/1,693.72 = 744.31/x
  3. Step 3: Cross multiply
    1,129.15x = 1,693.72 × 744.31
  4. Step 4: Simplify right side
    1,129.15x = 1,260,642.40
  5. Step 5: Solve for x
    x = 1,260,642.40/1,129.15
  6. Step 6: Final answer
    x = 1,116.46

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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.