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Finding the Fourth Proportional to 997.40, 1,493.36 and 753.20

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Solution

The fourth proportional to 997.40, 1,493.36 and 753.20 is: 1,127.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.40 : 1,493.36 = 753.20 : x
  2. Step 2: Convert to fraction form
    997.40/1,493.36 = 753.20/x
  3. Step 3: Cross multiply
    997.40x = 1,493.36 × 753.20
  4. Step 4: Simplify right side
    997.40x = 1,124,798.75
  5. Step 5: Solve for x
    x = 1,124,798.75/997.40
  6. Step 6: Final answer
    x = 1,127.73

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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.