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Finding the Fourth Proportional to 385.52, 577.12 and 287.76

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Solution

The fourth proportional to 385.52, 577.12 and 287.76 is: 430.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.52 : 577.12 = 287.76 : x
  2. Step 2: Convert to fraction form
    385.52/577.12 = 287.76/x
  3. Step 3: Cross multiply
    385.52x = 577.12 × 287.76
  4. Step 4: Simplify right side
    385.52x = 166,072.05
  5. Step 5: Solve for x
    x = 166,072.05/385.52
  6. Step 6: Final answer
    x = 430.77

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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.