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Finding the Fourth Proportional to 485.02, 727.99 and 385.70

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Solution

The fourth proportional to 485.02, 727.99 and 385.70 is: 578.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.02 : 727.99 = 385.70 : x
  2. Step 2: Convert to fraction form
    485.02/727.99 = 385.70/x
  3. Step 3: Cross multiply
    485.02x = 727.99 × 385.70
  4. Step 4: Simplify right side
    485.02x = 280,781.14
  5. Step 5: Solve for x
    x = 280,781.14/485.02
  6. Step 6: Final answer
    x = 578.90

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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.