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Finding the Fourth Proportional to 385.12, 577.90 and 141.72

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Solution

The fourth proportional to 385.12, 577.90 and 141.72 is: 212.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.12 : 577.90 = 141.72 : x
  2. Step 2: Convert to fraction form
    385.12/577.90 = 141.72/x
  3. Step 3: Cross multiply
    385.12x = 577.90 × 141.72
  4. Step 4: Simplify right side
    385.12x = 81,899.99
  5. Step 5: Solve for x
    x = 81,899.99/385.12
  6. Step 6: Final answer
    x = 212.66

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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.