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Finding the Fourth Proportional to 1,272.84, 1,755.60 and 1,036.79

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Solution

The fourth proportional to 1,272.84, 1,755.60 and 1,036.79 is: 1,430.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.84 : 1,755.60 = 1,036.79 : x
  2. Step 2: Convert to fraction form
    1,272.84/1,755.60 = 1,036.79/x
  3. Step 3: Cross multiply
    1,272.84x = 1,755.60 × 1,036.79
  4. Step 4: Simplify right side
    1,272.84x = 1,820,188.52
  5. Step 5: Solve for x
    x = 1,820,188.52/1,272.84
  6. Step 6: Final answer
    x = 1,430.02

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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.