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Finding the Fourth Proportional to 752.97, 1,038.90 and 438.18

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Solution

The fourth proportional to 752.97, 1,038.90 and 438.18 is: 604.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.97 : 1,038.90 = 438.18 : x
  2. Step 2: Convert to fraction form
    752.97/1,038.90 = 438.18/x
  3. Step 3: Cross multiply
    752.97x = 1,038.90 × 438.18
  4. Step 4: Simplify right side
    752.97x = 455,225.20
  5. Step 5: Solve for x
    x = 455,225.20/752.97
  6. Step 6: Final answer
    x = 604.57

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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.