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Finding the Fourth Proportional to 910.13, 1,361.64 and 776.68

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Solution

The fourth proportional to 910.13, 1,361.64 and 776.68 is: 1,161.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.13 : 1,361.64 = 776.68 : x
  2. Step 2: Convert to fraction form
    910.13/1,361.64 = 776.68/x
  3. Step 3: Cross multiply
    910.13x = 1,361.64 × 776.68
  4. Step 4: Simplify right side
    910.13x = 1,057,558.56
  5. Step 5: Solve for x
    x = 1,057,558.56/910.13
  6. Step 6: Final answer
    x = 1,161.99

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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.