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Finding the Fourth Proportional to 752.13, 1,128.18 and 318.99

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Solution

The fourth proportional to 752.13, 1,128.18 and 318.99 is: 478.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.13 : 1,128.18 = 318.99 : x
  2. Step 2: Convert to fraction form
    752.13/1,128.18 = 318.99/x
  3. Step 3: Cross multiply
    752.13x = 1,128.18 × 318.99
  4. Step 4: Simplify right side
    752.13x = 359,878.14
  5. Step 5: Solve for x
    x = 359,878.14/752.13
  6. Step 6: Final answer
    x = 478.48

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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.