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Finding the Fourth Proportional to 1,272.56, 1,755.60 and 830.30

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Solution

The fourth proportional to 1,272.56, 1,755.60 and 830.30 is: 1,145.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.56 : 1,755.60 = 830.30 : x
  2. Step 2: Convert to fraction form
    1,272.56/1,755.60 = 830.30/x
  3. Step 3: Cross multiply
    1,272.56x = 1,755.60 × 830.30
  4. Step 4: Simplify right side
    1,272.56x = 1,457,674.68
  5. Step 5: Solve for x
    x = 1,457,674.68/1,272.56
  6. Step 6: Final answer
    x = 1,145.47

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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.