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Finding the Fourth Proportional to 921.27, 1,271.39 and 528.33

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Solution

The fourth proportional to 921.27, 1,271.39 and 528.33 is: 729.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.27 : 1,271.39 = 528.33 : x
  2. Step 2: Convert to fraction form
    921.27/1,271.39 = 528.33/x
  3. Step 3: Cross multiply
    921.27x = 1,271.39 × 528.33
  4. Step 4: Simplify right side
    921.27x = 671,713.48
  5. Step 5: Solve for x
    x = 671,713.48/921.27
  6. Step 6: Final answer
    x = 729.12

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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.