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Finding the Fourth Proportional to 280.89, 387.60 and 156.55

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Solution

The fourth proportional to 280.89, 387.60 and 156.55 is: 216.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.89 : 387.60 = 156.55 : x
  2. Step 2: Convert to fraction form
    280.89/387.60 = 156.55/x
  3. Step 3: Cross multiply
    280.89x = 387.60 × 156.55
  4. Step 4: Simplify right side
    280.89x = 60,678.78
  5. Step 5: Solve for x
    x = 60,678.78/280.89
  6. Step 6: Final answer
    x = 216.02

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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.