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Finding the Fourth Proportional to 385.16, 577.85 and 111.25

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Solution

The fourth proportional to 385.16, 577.85 and 111.25 is: 166.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.16 : 577.85 = 111.25 : x
  2. Step 2: Convert to fraction form
    385.16/577.85 = 111.25/x
  3. Step 3: Cross multiply
    385.16x = 577.85 × 111.25
  4. Step 4: Simplify right side
    385.16x = 64,283.81
  5. Step 5: Solve for x
    x = 64,283.81/385.16
  6. Step 6: Final answer
    x = 166.90

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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.