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Finding the Fourth Proportional to 612.70, 918.78 and 201.90

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Solution

The fourth proportional to 612.70, 918.78 and 201.90 is: 302.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.70 : 918.78 = 201.90 : x
  2. Step 2: Convert to fraction form
    612.70/918.78 = 201.90/x
  3. Step 3: Cross multiply
    612.70x = 918.78 × 201.90
  4. Step 4: Simplify right side
    612.70x = 185,501.68
  5. Step 5: Solve for x
    x = 185,501.68/612.70
  6. Step 6: Final answer
    x = 302.76

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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.