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Finding the Fourth Proportional to 930.16, 1,393.94 and 723.80

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Solution

The fourth proportional to 930.16, 1,393.94 and 723.80 is: 1,084.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.16 : 1,393.94 = 723.80 : x
  2. Step 2: Convert to fraction form
    930.16/1,393.94 = 723.80/x
  3. Step 3: Cross multiply
    930.16x = 1,393.94 × 723.80
  4. Step 4: Simplify right side
    930.16x = 1,008,933.77
  5. Step 5: Solve for x
    x = 1,008,933.77/930.16
  6. Step 6: Final answer
    x = 1,084.69

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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.