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Finding the Fourth Proportional to 1,172.64, 1,619.28 and 780.32

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Solution

The fourth proportional to 1,172.64, 1,619.28 and 780.32 is: 1,077.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.64 : 1,619.28 = 780.32 : x
  2. Step 2: Convert to fraction form
    1,172.64/1,619.28 = 780.32/x
  3. Step 3: Cross multiply
    1,172.64x = 1,619.28 × 780.32
  4. Step 4: Simplify right side
    1,172.64x = 1,263,556.57
  5. Step 5: Solve for x
    x = 1,263,556.57/1,172.64
  6. Step 6: Final answer
    x = 1,077.53

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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.