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Finding the Fourth Proportional to 930.48, 1,396.92 and 656.70

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Solution

The fourth proportional to 930.48, 1,396.92 and 656.70 is: 985.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.48 : 1,396.92 = 656.70 : x
  2. Step 2: Convert to fraction form
    930.48/1,396.92 = 656.70/x
  3. Step 3: Cross multiply
    930.48x = 1,396.92 × 656.70
  4. Step 4: Simplify right side
    930.48x = 917,357.36
  5. Step 5: Solve for x
    x = 917,357.36/930.48
  6. Step 6: Final answer
    x = 985.90

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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.