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Finding the Fourth Proportional to 930, 1,394.58 and 280.64

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Solution

The fourth proportional to 930, 1,394.58 and 280.64 is: 420.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    930 : 1,394.58 = 280.64 : x
  2. Step 2: Convert to fraction form
    930/1,394.58 = 280.64/x
  3. Step 3: Cross multiply
    930x = 1,394.58 × 280.64
  4. Step 4: Simplify right side
    930x = 391,374.93
  5. Step 5: Solve for x
    x = 391,374.93/930
  6. Step 6: Final answer
    x = 420.83

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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.