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Finding the Fourth Proportional to 752.72, 1,038.82 and 693.90

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Solution

The fourth proportional to 752.72, 1,038.82 and 693.90 is: 957.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.72 : 1,038.82 = 693.90 : x
  2. Step 2: Convert to fraction form
    752.72/1,038.82 = 693.90/x
  3. Step 3: Cross multiply
    752.72x = 1,038.82 × 693.90
  4. Step 4: Simplify right side
    752.72x = 720,837.20
  5. Step 5: Solve for x
    x = 720,837.20/752.72
  6. Step 6: Final answer
    x = 957.64

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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.