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Finding the Fourth Proportional to 1,390.26, 1,918.57 and 760.79

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Solution

The fourth proportional to 1,390.26, 1,918.57 and 760.79 is: 1,049.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.26 : 1,918.57 = 760.79 : x
  2. Step 2: Convert to fraction form
    1,390.26/1,918.57 = 760.79/x
  3. Step 3: Cross multiply
    1,390.26x = 1,918.57 × 760.79
  4. Step 4: Simplify right side
    1,390.26x = 1,459,629.17
  5. Step 5: Solve for x
    x = 1,459,629.17/1,390.26
  6. Step 6: Final answer
    x = 1,049.89

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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.