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Finding the Fourth Proportional to 385.20, 529.92 and 374.40

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Solution

The fourth proportional to 385.20, 529.92 and 374.40 is: 515.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.20 : 529.92 = 374.40 : x
  2. Step 2: Convert to fraction form
    385.20/529.92 = 374.40/x
  3. Step 3: Cross multiply
    385.20x = 529.92 × 374.40
  4. Step 4: Simplify right side
    385.20x = 198,402.05
  5. Step 5: Solve for x
    x = 198,402.05/385.20
  6. Step 6: Final answer
    x = 515.06

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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.