Home / 1,172.76-1,619.10-780.60

Finding the Fourth Proportional to 1,172.76, 1,619.10 and 780.60

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Solution

The fourth proportional to 1,172.76, 1,619.10 and 780.60 is: 1,077.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.76 : 1,619.10 = 780.60 : x
  2. Step 2: Convert to fraction form
    1,172.76/1,619.10 = 780.60/x
  3. Step 3: Cross multiply
    1,172.76x = 1,619.10 × 780.60
  4. Step 4: Simplify right side
    1,172.76x = 1,263,869.46
  5. Step 5: Solve for x
    x = 1,263,869.46/1,172.76
  6. Step 6: Final answer
    x = 1,077.69

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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.