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Finding the Fourth Proportional to 148.45, 204.85 and 86.30

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Solution

The fourth proportional to 148.45, 204.85 and 86.30 is: 119.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.45 : 204.85 = 86.30 : x
  2. Step 2: Convert to fraction form
    148.45/204.85 = 86.30/x
  3. Step 3: Cross multiply
    148.45x = 204.85 × 86.30
  4. Step 4: Simplify right side
    148.45x = 17,677.32
  5. Step 5: Solve for x
    x = 17,677.32/148.45
  6. Step 6: Final answer
    x = 119.08

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.