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Finding the Fourth Proportional to 693.32, 1,039.50 and 328.36

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Solution

The fourth proportional to 693.32, 1,039.50 and 328.36 is: 492.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.32 : 1,039.50 = 328.36 : x
  2. Step 2: Convert to fraction form
    693.32/1,039.50 = 328.36/x
  3. Step 3: Cross multiply
    693.32x = 1,039.50 × 328.36
  4. Step 4: Simplify right side
    693.32x = 341,330.22
  5. Step 5: Solve for x
    x = 341,330.22/693.32
  6. Step 6: Final answer
    x = 492.31

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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.