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Finding the Fourth Proportional to 930.34, 1,394.70 and 442.72

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Solution

The fourth proportional to 930.34, 1,394.70 and 442.72 is: 663.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.34 : 1,394.70 = 442.72 : x
  2. Step 2: Convert to fraction form
    930.34/1,394.70 = 442.72/x
  3. Step 3: Cross multiply
    930.34x = 1,394.70 × 442.72
  4. Step 4: Simplify right side
    930.34x = 617,461.58
  5. Step 5: Solve for x
    x = 617,461.58/930.34
  6. Step 6: Final answer
    x = 663.69

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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.