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Finding the Fourth Proportional to 1,173.88, 1,619.56 and 780.48

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Solution

The fourth proportional to 1,173.88, 1,619.56 and 780.48 is: 1,076.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,173.88 : 1,619.56 = 780.48 : x
  2. Step 2: Convert to fraction form
    1,173.88/1,619.56 = 780.48/x
  3. Step 3: Cross multiply
    1,173.88x = 1,619.56 × 780.48
  4. Step 4: Simplify right side
    1,173.88x = 1,264,034.19
  5. Step 5: Solve for x
    x = 1,264,034.19/1,173.88
  6. Step 6: Final answer
    x = 1,076.80

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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.