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Finding the Fourth Proportional to 280.76, 386.72 and 236.45

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Solution

The fourth proportional to 280.76, 386.72 and 236.45 is: 325.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.76 : 386.72 = 236.45 : x
  2. Step 2: Convert to fraction form
    280.76/386.72 = 236.45/x
  3. Step 3: Cross multiply
    280.76x = 386.72 × 236.45
  4. Step 4: Simplify right side
    280.76x = 91,439.94
  5. Step 5: Solve for x
    x = 91,439.94/280.76
  6. Step 6: Final answer
    x = 325.69

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Find fourth proportional to 140.38, 193.36 and 118.23
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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.