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Finding the Fourth Proportional to 280.49, 387.12 and 233.78

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Solution

The fourth proportional to 280.49, 387.12 and 233.78 is: 322.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.49 : 387.12 = 233.78 : x
  2. Step 2: Convert to fraction form
    280.49/387.12 = 233.78/x
  3. Step 3: Cross multiply
    280.49x = 387.12 × 233.78
  4. Step 4: Simplify right side
    280.49x = 90,501.88
  5. Step 5: Solve for x
    x = 90,501.88/280.49
  6. Step 6: Final answer
    x = 322.66

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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.