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Finding the Fourth Proportional to 609.60, 840.90 and 451.92

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Solution

The fourth proportional to 609.60, 840.90 and 451.92 is: 623.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.60 : 840.90 = 451.92 : x
  2. Step 2: Convert to fraction form
    609.60/840.90 = 451.92/x
  3. Step 3: Cross multiply
    609.60x = 840.90 × 451.92
  4. Step 4: Simplify right side
    609.60x = 380,019.53
  5. Step 5: Solve for x
    x = 380,019.53/609.60
  6. Step 6: Final answer
    x = 623.39

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.