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Finding the Fourth Proportional to 612.63, 919.10 and 287.62

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Solution

The fourth proportional to 612.63, 919.10 and 287.62 is: 431.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.63 : 919.10 = 287.62 : x
  2. Step 2: Convert to fraction form
    612.63/919.10 = 287.62/x
  3. Step 3: Cross multiply
    612.63x = 919.10 × 287.62
  4. Step 4: Simplify right side
    612.63x = 264,351.54
  5. Step 5: Solve for x
    x = 264,351.54/612.63
  6. Step 6: Final answer
    x = 431.50

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Double scale
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Similar ratio
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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.