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Finding the Fourth Proportional to 612.32, 918.72 and 381.56

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Solution

The fourth proportional to 612.32, 918.72 and 381.56 is: 572.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.32 : 918.72 = 381.56 : x
  2. Step 2: Convert to fraction form
    612.32/918.72 = 381.56/x
  3. Step 3: Cross multiply
    612.32x = 918.72 × 381.56
  4. Step 4: Simplify right side
    612.32x = 350,546.80
  5. Step 5: Solve for x
    x = 350,546.80/612.32
  6. Step 6: Final answer
    x = 572.49

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Half scale
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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.