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Finding the Fourth Proportional to 280.18, 386.28 and 206.50

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Solution

The fourth proportional to 280.18, 386.28 and 206.50 is: 284.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.18 : 386.28 = 206.50 : x
  2. Step 2: Convert to fraction form
    280.18/386.28 = 206.50/x
  3. Step 3: Cross multiply
    280.18x = 386.28 × 206.50
  4. Step 4: Simplify right side
    280.18x = 79,766.82
  5. Step 5: Solve for x
    x = 79,766.82/280.18
  6. Step 6: Final answer
    x = 284.70

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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.