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Finding the Fourth Proportional to 612.39, 918.60 and 201.55

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Solution

The fourth proportional to 612.39, 918.60 and 201.55 is: 302.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.39 : 918.60 = 201.55 : x
  2. Step 2: Convert to fraction form
    612.39/918.60 = 201.55/x
  3. Step 3: Cross multiply
    612.39x = 918.60 × 201.55
  4. Step 4: Simplify right side
    612.39x = 185,143.83
  5. Step 5: Solve for x
    x = 185,143.83/612.39
  6. Step 6: Final answer
    x = 302.33

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1.5x scale

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.