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Finding the Fourth Proportional to 618.74, 928.26 and 436.49

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Solution

The fourth proportional to 618.74, 928.26 and 436.49 is: 654.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.74 : 928.26 = 436.49 : x
  2. Step 2: Convert to fraction form
    618.74/928.26 = 436.49/x
  3. Step 3: Cross multiply
    618.74x = 928.26 × 436.49
  4. Step 4: Simplify right side
    618.74x = 405,176.21
  5. Step 5: Solve for x
    x = 405,176.21/618.74
  6. Step 6: Final answer
    x = 654.84

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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.