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Finding the Fourth Proportional to 579.76, 799.68 and 393.19

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Solution

The fourth proportional to 579.76, 799.68 and 393.19 is: 542.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.76 : 799.68 = 393.19 : x
  2. Step 2: Convert to fraction form
    579.76/799.68 = 393.19/x
  3. Step 3: Cross multiply
    579.76x = 799.68 × 393.19
  4. Step 4: Simplify right side
    579.76x = 314,426.18
  5. Step 5: Solve for x
    x = 314,426.18/579.76
  6. Step 6: Final answer
    x = 542.34

Related Problems

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Half scale
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Double scale
Find fourth proportional to 580.76, 801.06 and 394.19
Similar ratio
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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.