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Finding the Fourth Proportional to 921.26, 1,382.06 and 434.32

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Solution

The fourth proportional to 921.26, 1,382.06 and 434.32 is: 651.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.26 : 1,382.06 = 434.32 : x
  2. Step 2: Convert to fraction form
    921.26/1,382.06 = 434.32/x
  3. Step 3: Cross multiply
    921.26x = 1,382.06 × 434.32
  4. Step 4: Simplify right side
    921.26x = 600,256.30
  5. Step 5: Solve for x
    x = 600,256.30/921.26
  6. Step 6: Final answer
    x = 651.56

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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.