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Finding the Fourth Proportional to 1,079.76, 1,619.40 and 770.68

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Solution

The fourth proportional to 1,079.76, 1,619.40 and 770.68 is: 1,155.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.76 : 1,619.40 = 770.68 : x
  2. Step 2: Convert to fraction form
    1,079.76/1,619.40 = 770.68/x
  3. Step 3: Cross multiply
    1,079.76x = 1,619.40 × 770.68
  4. Step 4: Simplify right side
    1,079.76x = 1,248,039.19
  5. Step 5: Solve for x
    x = 1,248,039.19/1,079.76
  6. Step 6: Final answer
    x = 1,155.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.