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Finding the Fourth Proportional to 492.96, 738.36 and 390.36

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Solution

The fourth proportional to 492.96, 738.36 and 390.36 is: 584.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.96 : 738.36 = 390.36 : x
  2. Step 2: Convert to fraction form
    492.96/738.36 = 390.36/x
  3. Step 3: Cross multiply
    492.96x = 738.36 × 390.36
  4. Step 4: Simplify right side
    492.96x = 288,226.21
  5. Step 5: Solve for x
    x = 288,226.21/492.96
  6. Step 6: Final answer
    x = 584.68

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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.