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Finding the Fourth Proportional to 280.70, 387.20 and 175.60

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Solution

The fourth proportional to 280.70, 387.20 and 175.60 is: 242.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.70 : 387.20 = 175.60 : x
  2. Step 2: Convert to fraction form
    280.70/387.20 = 175.60/x
  3. Step 3: Cross multiply
    280.70x = 387.20 × 175.60
  4. Step 4: Simplify right side
    280.70x = 67,992.32
  5. Step 5: Solve for x
    x = 67,992.32/280.70
  6. Step 6: Final answer
    x = 242.22

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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.