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Finding the Fourth Proportional to 494.70, 740.70 and 385.80

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Solution

The fourth proportional to 494.70, 740.70 and 385.80 is: 577.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    494.70 : 740.70 = 385.80 : x
  2. Step 2: Convert to fraction form
    494.70/740.70 = 385.80/x
  3. Step 3: Cross multiply
    494.70x = 740.70 × 385.80
  4. Step 4: Simplify right side
    494.70x = 285,762.06
  5. Step 5: Solve for x
    x = 285,762.06/494.70
  6. Step 6: Final answer
    x = 577.65

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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.