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Finding the Fourth Proportional to 921.91, 1,272.10 and 528.86

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Solution

The fourth proportional to 921.91, 1,272.10 and 528.86 is: 729.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.91 : 1,272.10 = 528.86 : x
  2. Step 2: Convert to fraction form
    921.91/1,272.10 = 528.86/x
  3. Step 3: Cross multiply
    921.91x = 1,272.10 × 528.86
  4. Step 4: Simplify right side
    921.91x = 672,762.81
  5. Step 5: Solve for x
    x = 672,762.81/921.91
  6. Step 6: Final answer
    x = 729.75

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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.