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Finding the Fourth Proportional to 1,173.69, 1,619.19 and 780.84

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Solution

The fourth proportional to 1,173.69, 1,619.19 and 780.84 is: 1,077.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,173.69 : 1,619.19 = 780.84 : x
  2. Step 2: Convert to fraction form
    1,173.69/1,619.19 = 780.84/x
  3. Step 3: Cross multiply
    1,173.69x = 1,619.19 × 780.84
  4. Step 4: Simplify right side
    1,173.69x = 1,264,328.32
  5. Step 5: Solve for x
    x = 1,264,328.32/1,173.69
  6. Step 6: Final answer
    x = 1,077.23

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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.