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Finding the Fourth Proportional to 1,195.20, 1,648.96 and 776.08

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Solution

The fourth proportional to 1,195.20, 1,648.96 and 776.08 is: 1,070.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,195.20 : 1,648.96 = 776.08 : x
  2. Step 2: Convert to fraction form
    1,195.20/1,648.96 = 776.08/x
  3. Step 3: Cross multiply
    1,195.20x = 1,648.96 × 776.08
  4. Step 4: Simplify right side
    1,195.20x = 1,279,724.88
  5. Step 5: Solve for x
    x = 1,279,724.88/1,195.20
  6. Step 6: Final answer
    x = 1,070.72

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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.