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Finding the Fourth Proportional to 1,279.49, 1,917.40 and 730.53

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Solution

The fourth proportional to 1,279.49, 1,917.40 and 730.53 is: 1,094.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.49 : 1,917.40 = 730.53 : x
  2. Step 2: Convert to fraction form
    1,279.49/1,917.40 = 730.53/x
  3. Step 3: Cross multiply
    1,279.49x = 1,917.40 × 730.53
  4. Step 4: Simplify right side
    1,279.49x = 1,400,718.22
  5. Step 5: Solve for x
    x = 1,400,718.22/1,279.49
  6. Step 6: Final answer
    x = 1,094.75

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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.