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Finding the Fourth Proportional to 921.76, 1,382.16 and 434.68

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Solution

The fourth proportional to 921.76, 1,382.16 and 434.68 is: 651.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.76 : 1,382.16 = 434.68 : x
  2. Step 2: Convert to fraction form
    921.76/1,382.16 = 434.68/x
  3. Step 3: Cross multiply
    921.76x = 1,382.16 × 434.68
  4. Step 4: Simplify right side
    921.76x = 600,797.31
  5. Step 5: Solve for x
    x = 600,797.31/921.76
  6. Step 6: Final answer
    x = 651.79

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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.