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Finding the Fourth Proportional to 578.64, 799.42 and 485.22

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Solution

The fourth proportional to 578.64, 799.42 and 485.22 is: 670.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.64 : 799.42 = 485.22 : x
  2. Step 2: Convert to fraction form
    578.64/799.42 = 485.22/x
  3. Step 3: Cross multiply
    578.64x = 799.42 × 485.22
  4. Step 4: Simplify right side
    578.64x = 387,894.57
  5. Step 5: Solve for x
    x = 387,894.57/578.64
  6. Step 6: Final answer
    x = 670.36

Related Problems

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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.