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Finding the Fourth Proportional to 930.61, 1,395.69 and 382.95

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Solution

The fourth proportional to 930.61, 1,395.69 and 382.95 is: 574.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.61 : 1,395.69 = 382.95 : x
  2. Step 2: Convert to fraction form
    930.61/1,395.69 = 382.95/x
  3. Step 3: Cross multiply
    930.61x = 1,395.69 × 382.95
  4. Step 4: Simplify right side
    930.61x = 534,479.49
  5. Step 5: Solve for x
    x = 534,479.49/930.61
  6. Step 6: Final answer
    x = 574.33

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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.