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Finding the Fourth Proportional to 280.98, 387.71 and 156.64

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Solution

The fourth proportional to 280.98, 387.71 and 156.64 is: 216.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.98 : 387.71 = 156.64 : x
  2. Step 2: Convert to fraction form
    280.98/387.71 = 156.64/x
  3. Step 3: Cross multiply
    280.98x = 387.71 × 156.64
  4. Step 4: Simplify right side
    280.98x = 60,729.73
  5. Step 5: Solve for x
    x = 60,729.73/280.98
  6. Step 6: Final answer
    x = 216.13

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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.