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Finding the Fourth Proportional to 921.33, 1,381.76 and 574.48

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Solution

The fourth proportional to 921.33, 1,381.76 and 574.48 is: 861.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.33 : 1,381.76 = 574.48 : x
  2. Step 2: Convert to fraction form
    921.33/1,381.76 = 574.48/x
  3. Step 3: Cross multiply
    921.33x = 1,381.76 × 574.48
  4. Step 4: Simplify right side
    921.33x = 793,800.32
  5. Step 5: Solve for x
    x = 793,800.32/921.33
  6. Step 6: Final answer
    x = 861.58

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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.