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Finding the Fourth Proportional to 1,255.96, 1,732.45 and 989.99

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Solution

The fourth proportional to 1,255.96, 1,732.45 and 989.99 is: 1,365.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,255.96 : 1,732.45 = 989.99 : x
  2. Step 2: Convert to fraction form
    1,255.96/1,732.45 = 989.99/x
  3. Step 3: Cross multiply
    1,255.96x = 1,732.45 × 989.99
  4. Step 4: Simplify right side
    1,255.96x = 1,715,097.04
  5. Step 5: Solve for x
    x = 1,715,097.04/1,255.96
  6. Step 6: Final answer
    x = 1,365.57

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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.