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Finding the Fourth Proportional to 921.96, 1,272.42 and 528.93

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Solution

The fourth proportional to 921.96, 1,272.42 and 528.93 is: 729.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.96 : 1,272.42 = 528.93 : x
  2. Step 2: Convert to fraction form
    921.96/1,272.42 = 528.93/x
  3. Step 3: Cross multiply
    921.96x = 1,272.42 × 528.93
  4. Step 4: Simplify right side
    921.96x = 673,021.11
  5. Step 5: Solve for x
    x = 673,021.11/921.96
  6. Step 6: Final answer
    x = 729.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.