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Finding the Fourth Proportional to 509.20, 701.40 and 392.56

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Solution

The fourth proportional to 509.20, 701.40 and 392.56 is: 540.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.20 : 701.40 = 392.56 : x
  2. Step 2: Convert to fraction form
    509.20/701.40 = 392.56/x
  3. Step 3: Cross multiply
    509.20x = 701.40 × 392.56
  4. Step 4: Simplify right side
    509.20x = 275,341.58
  5. Step 5: Solve for x
    x = 275,341.58/509.20
  6. Step 6: Final answer
    x = 540.73

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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.