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Finding the Fourth Proportional to 755.43, 1,130.79 and 581.64

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Solution

The fourth proportional to 755.43, 1,130.79 and 581.64 is: 870.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.43 : 1,130.79 = 581.64 : x
  2. Step 2: Convert to fraction form
    755.43/1,130.79 = 581.64/x
  3. Step 3: Cross multiply
    755.43x = 1,130.79 × 581.64
  4. Step 4: Simplify right side
    755.43x = 657,713.68
  5. Step 5: Solve for x
    x = 657,713.68/755.43
  6. Step 6: Final answer
    x = 870.65

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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.