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Finding the Fourth Proportional to 280.94, 387.70 and 156.61

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Solution

The fourth proportional to 280.94, 387.70 and 156.61 is: 216.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.94 : 387.70 = 156.61 : x
  2. Step 2: Convert to fraction form
    280.94/387.70 = 156.61/x
  3. Step 3: Cross multiply
    280.94x = 387.70 × 156.61
  4. Step 4: Simplify right side
    280.94x = 60,715.76
  5. Step 5: Solve for x
    x = 60,715.76/280.94
  6. Step 6: Final answer
    x = 216.12

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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.