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Finding the Fourth Proportional to 612.85, 919.31 and 202.11

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Solution

The fourth proportional to 612.85, 919.31 and 202.11 is: 303.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.85 : 919.31 = 202.11 : x
  2. Step 2: Convert to fraction form
    612.85/919.31 = 202.11/x
  3. Step 3: Cross multiply
    612.85x = 919.31 × 202.11
  4. Step 4: Simplify right side
    612.85x = 185,801.74
  5. Step 5: Solve for x
    x = 185,801.74/612.85
  6. Step 6: Final answer
    x = 303.18

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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.