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Finding the Fourth Proportional to 492.30, 738.84 and 390.60

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Solution

The fourth proportional to 492.30, 738.84 and 390.60 is: 586.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.30 : 738.84 = 390.60 : x
  2. Step 2: Convert to fraction form
    492.30/738.84 = 390.60/x
  3. Step 3: Cross multiply
    492.30x = 738.84 × 390.60
  4. Step 4: Simplify right side
    492.30x = 288,590.90
  5. Step 5: Solve for x
    x = 288,590.90/492.30
  6. Step 6: Final answer
    x = 586.21

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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.