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Finding the Fourth Proportional to 752.83, 1,129.59 and 445.29

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Solution

The fourth proportional to 752.83, 1,129.59 and 445.29 is: 668.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.83 : 1,129.59 = 445.29 : x
  2. Step 2: Convert to fraction form
    752.83/1,129.59 = 445.29/x
  3. Step 3: Cross multiply
    752.83x = 1,129.59 × 445.29
  4. Step 4: Simplify right side
    752.83x = 502,991.52
  5. Step 5: Solve for x
    x = 502,991.52/752.83
  6. Step 6: Final answer
    x = 668.13

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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.