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Finding the Fourth Proportional to 385.00, 577.60 and 138.22

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Solution

The fourth proportional to 385.00, 577.60 and 138.22 is: 207.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.00 : 577.60 = 138.22 : x
  2. Step 2: Convert to fraction form
    385.00/577.60 = 138.22/x
  3. Step 3: Cross multiply
    385.00x = 577.60 × 138.22
  4. Step 4: Simplify right side
    385.00x = 79,834.08
  5. Step 5: Solve for x
    x = 79,834.08/385.00
  6. Step 6: Final answer
    x = 207.36

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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.