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Finding the Fourth Proportional to 921.88, 1,272.26 and 528.91

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Solution

The fourth proportional to 921.88, 1,272.26 and 528.91 is: 729.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.88 : 1,272.26 = 528.91 : x
  2. Step 2: Convert to fraction form
    921.88/1,272.26 = 528.91/x
  3. Step 3: Cross multiply
    921.88x = 1,272.26 × 528.91
  4. Step 4: Simplify right side
    921.88x = 672,911.04
  5. Step 5: Solve for x
    x = 672,911.04/921.88
  6. Step 6: Final answer
    x = 729.93

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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.