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Finding the Fourth Proportional to 119.30, 178.79 and 70.45

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Solution

The fourth proportional to 119.30, 178.79 and 70.45 is: 105.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.30 : 178.79 = 70.45 : x
  2. Step 2: Convert to fraction form
    119.30/178.79 = 70.45/x
  3. Step 3: Cross multiply
    119.30x = 178.79 × 70.45
  4. Step 4: Simplify right side
    119.30x = 12,595.76
  5. Step 5: Solve for x
    x = 12,595.76/119.30
  6. Step 6: Final answer
    x = 105.58

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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.