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Finding the Fourth Proportional to 575.80, 863.70 and 393.40

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Solution

The fourth proportional to 575.80, 863.70 and 393.40 is: 590.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    575.80 : 863.70 = 393.40 : x
  2. Step 2: Convert to fraction form
    575.80/863.70 = 393.40/x
  3. Step 3: Cross multiply
    575.80x = 863.70 × 393.40
  4. Step 4: Simplify right side
    575.80x = 339,779.58
  5. Step 5: Solve for x
    x = 339,779.58/575.80
  6. Step 6: Final answer
    x = 590.10

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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.