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Finding the Fourth Proportional to 757.77, 1,043.42 and 663.99

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Solution

The fourth proportional to 757.77, 1,043.42 and 663.99 is: 914.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.77 : 1,043.42 = 663.99 : x
  2. Step 2: Convert to fraction form
    757.77/1,043.42 = 663.99/x
  3. Step 3: Cross multiply
    757.77x = 1,043.42 × 663.99
  4. Step 4: Simplify right side
    757.77x = 692,817.13
  5. Step 5: Solve for x
    x = 692,817.13/757.77
  6. Step 6: Final answer
    x = 914.28

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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.