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Finding the Fourth Proportional to 1,296.18, 1,939.48 and 776.54

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Solution

The fourth proportional to 1,296.18, 1,939.48 and 776.54 is: 1,161.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,296.18 : 1,939.48 = 776.54 : x
  2. Step 2: Convert to fraction form
    1,296.18/1,939.48 = 776.54/x
  3. Step 3: Cross multiply
    1,296.18x = 1,939.48 × 776.54
  4. Step 4: Simplify right side
    1,296.18x = 1,506,090.10
  5. Step 5: Solve for x
    x = 1,506,090.10/1,296.18
  6. Step 6: Final answer
    x = 1,161.95

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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.