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Finding the Fourth Proportional to 280.32, 386.86 and 155.99

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Solution

The fourth proportional to 280.32, 386.86 and 155.99 is: 215.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.32 : 386.86 = 155.99 : x
  2. Step 2: Convert to fraction form
    280.32/386.86 = 155.99/x
  3. Step 3: Cross multiply
    280.32x = 386.86 × 155.99
  4. Step 4: Simplify right side
    280.32x = 60,346.19
  5. Step 5: Solve for x
    x = 60,346.19/280.32
  6. Step 6: Final answer
    x = 215.27

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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.