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Finding the Fourth Proportional to 936.90, 1,405.56 and 436.32

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Solution

The fourth proportional to 936.90, 1,405.56 and 436.32 is: 654.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.90 : 1,405.56 = 436.32 : x
  2. Step 2: Convert to fraction form
    936.90/1,405.56 = 436.32/x
  3. Step 3: Cross multiply
    936.90x = 1,405.56 × 436.32
  4. Step 4: Simplify right side
    936.90x = 613,273.94
  5. Step 5: Solve for x
    x = 613,273.94/936.90
  6. Step 6: Final answer
    x = 654.58

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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.