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Finding the Fourth Proportional to 280.84, 387.56 and 156.49

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Solution

The fourth proportional to 280.84, 387.56 and 156.49 is: 215.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.84 : 387.56 = 156.49 : x
  2. Step 2: Convert to fraction form
    280.84/387.56 = 156.49/x
  3. Step 3: Cross multiply
    280.84x = 387.56 × 156.49
  4. Step 4: Simplify right side
    280.84x = 60,646.54
  5. Step 5: Solve for x
    x = 60,646.54/280.84
  6. Step 6: Final answer
    x = 215.95

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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.