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Finding the Fourth Proportional to 921.57, 1,271.78 and 528.61

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Solution

The fourth proportional to 921.57, 1,271.78 and 528.61 is: 729.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.57 : 1,271.78 = 528.61 : x
  2. Step 2: Convert to fraction form
    921.57/1,271.78 = 528.61/x
  3. Step 3: Cross multiply
    921.57x = 1,271.78 × 528.61
  4. Step 4: Simplify right side
    921.57x = 672,272.98
  5. Step 5: Solve for x
    x = 672,272.98/921.57
  6. Step 6: Final answer
    x = 729.48

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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.