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Finding the Fourth Proportional to 757.05, 1,130.43 and 663.81

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Solution

The fourth proportional to 757.05, 1,130.43 and 663.81 is: 991.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.05 : 1,130.43 = 663.81 : x
  2. Step 2: Convert to fraction form
    757.05/1,130.43 = 663.81/x
  3. Step 3: Cross multiply
    757.05x = 1,130.43 × 663.81
  4. Step 4: Simplify right side
    757.05x = 750,390.74
  5. Step 5: Solve for x
    x = 750,390.74/757.05
  6. Step 6: Final answer
    x = 991.20

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.