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Finding the Fourth Proportional to 782.37, 1,173.24 and 320.39

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Solution

The fourth proportional to 782.37, 1,173.24 and 320.39 is: 480.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.37 : 1,173.24 = 320.39 : x
  2. Step 2: Convert to fraction form
    782.37/1,173.24 = 320.39/x
  3. Step 3: Cross multiply
    782.37x = 1,173.24 × 320.39
  4. Step 4: Simplify right side
    782.37x = 375,888.50
  5. Step 5: Solve for x
    x = 375,888.50/782.37
  6. Step 6: Final answer
    x = 480.45

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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.