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Finding the Fourth Proportional to 921.04, 1,380.96 and 434.08

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Solution

The fourth proportional to 921.04, 1,380.96 and 434.08 is: 650.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.04 : 1,380.96 = 434.08 : x
  2. Step 2: Convert to fraction form
    921.04/1,380.96 = 434.08/x
  3. Step 3: Cross multiply
    921.04x = 1,380.96 × 434.08
  4. Step 4: Simplify right side
    921.04x = 599,447.12
  5. Step 5: Solve for x
    x = 599,447.12/921.04
  6. Step 6: Final answer
    x = 650.84

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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.