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Finding the Fourth Proportional to 921.74, 1,383.38 and 374.31

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Solution

The fourth proportional to 921.74, 1,383.38 and 374.31 is: 561.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.74 : 1,383.38 = 374.31 : x
  2. Step 2: Convert to fraction form
    921.74/1,383.38 = 374.31/x
  3. Step 3: Cross multiply
    921.74x = 1,383.38 × 374.31
  4. Step 4: Simplify right side
    921.74x = 517,811.10
  5. Step 5: Solve for x
    x = 517,811.10/921.74
  6. Step 6: Final answer
    x = 561.78

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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.