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Finding the Fourth Proportional to 316, 473.82 and 280

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Solution

The fourth proportional to 316, 473.82 and 280 is: 419.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    316 : 473.82 = 280 : x
  2. Step 2: Convert to fraction form
    316/473.82 = 280/x
  3. Step 3: Cross multiply
    316x = 473.82 × 280
  4. Step 4: Simplify right side
    316x = 132,669.60
  5. Step 5: Solve for x
    x = 132,669.60/316
  6. Step 6: Final answer
    x = 419.84

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.