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Finding the Fourth Proportional to 385.48, 576.64 and 287.92

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Solution

The fourth proportional to 385.48, 576.64 and 287.92 is: 430.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.48 : 576.64 = 287.92 : x
  2. Step 2: Convert to fraction form
    385.48/576.64 = 287.92/x
  3. Step 3: Cross multiply
    385.48x = 576.64 × 287.92
  4. Step 4: Simplify right side
    385.48x = 166,026.19
  5. Step 5: Solve for x
    x = 166,026.19/385.48
  6. Step 6: Final answer
    x = 430.70

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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.