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Finding the Fourth Proportional to 385.56, 579.06 and 339.30

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Solution

The fourth proportional to 385.56, 579.06 and 339.30 is: 509.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.56 : 579.06 = 339.30 : x
  2. Step 2: Convert to fraction form
    385.56/579.06 = 339.30/x
  3. Step 3: Cross multiply
    385.56x = 579.06 × 339.30
  4. Step 4: Simplify right side
    385.56x = 196,475.06
  5. Step 5: Solve for x
    x = 196,475.06/385.56
  6. Step 6: Final answer
    x = 509.58

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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.