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Finding the Fourth Proportional to 930.77, 1,395.90 and 314.35

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Solution

The fourth proportional to 930.77, 1,395.90 and 314.35 is: 471.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.77 : 1,395.90 = 314.35 : x
  2. Step 2: Convert to fraction form
    930.77/1,395.90 = 314.35/x
  3. Step 3: Cross multiply
    930.77x = 1,395.90 × 314.35
  4. Step 4: Simplify right side
    930.77x = 438,797.68
  5. Step 5: Solve for x
    x = 438,797.68/930.77
  6. Step 6: Final answer
    x = 471.43

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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.