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Finding the Fourth Proportional to 930.34, 1,395.54 and 305.65

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Solution

The fourth proportional to 930.34, 1,395.54 and 305.65 is: 458.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.34 : 1,395.54 = 305.65 : x
  2. Step 2: Convert to fraction form
    930.34/1,395.54 = 305.65/x
  3. Step 3: Cross multiply
    930.34x = 1,395.54 × 305.65
  4. Step 4: Simplify right side
    930.34x = 426,540.29
  5. Step 5: Solve for x
    x = 426,540.29/930.34
  6. Step 6: Final answer
    x = 458.48

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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.