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Finding the Fourth Proportional to 693.02, 1,039.79 and 328.11

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Solution

The fourth proportional to 693.02, 1,039.79 and 328.11 is: 492.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.02 : 1,039.79 = 328.11 : x
  2. Step 2: Convert to fraction form
    693.02/1,039.79 = 328.11/x
  3. Step 3: Cross multiply
    693.02x = 1,039.79 × 328.11
  4. Step 4: Simplify right side
    693.02x = 341,166.32
  5. Step 5: Solve for x
    x = 341,166.32/693.02
  6. Step 6: Final answer
    x = 492.29

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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.