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Finding the Fourth Proportional to 280.58, 387.20 and 156.25

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Solution

The fourth proportional to 280.58, 387.20 and 156.25 is: 215.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.58 : 387.20 = 156.25 : x
  2. Step 2: Convert to fraction form
    280.58/387.20 = 156.25/x
  3. Step 3: Cross multiply
    280.58x = 387.20 × 156.25
  4. Step 4: Simplify right side
    280.58x = 60,497.82
  5. Step 5: Solve for x
    x = 60,497.82/280.58
  6. Step 6: Final answer
    x = 215.62

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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.