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Finding the Fourth Proportional to 936.40, 1,405.10 and 388.96

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Solution

The fourth proportional to 936.40, 1,405.10 and 388.96 is: 583.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.40 : 1,405.10 = 388.96 : x
  2. Step 2: Convert to fraction form
    936.40/1,405.10 = 388.96/x
  3. Step 3: Cross multiply
    936.40x = 1,405.10 × 388.96
  4. Step 4: Simplify right side
    936.40x = 546,525.16
  5. Step 5: Solve for x
    x = 546,525.16/936.40
  6. Step 6: Final answer
    x = 583.65

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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.