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Finding the Fourth Proportional to 921.27, 1,271.19 and 528.22

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Solution

The fourth proportional to 921.27, 1,271.19 and 528.22 is: 728.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.27 : 1,271.19 = 528.22 : x
  2. Step 2: Convert to fraction form
    921.27/1,271.19 = 528.22/x
  3. Step 3: Cross multiply
    921.27x = 1,271.19 × 528.22
  4. Step 4: Simplify right side
    921.27x = 671,471.55
  5. Step 5: Solve for x
    x = 671,471.55/921.27
  6. Step 6: Final answer
    x = 728.85

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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.