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Finding the Fourth Proportional to 921.38, 1,271.37 and 528.34

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Solution

The fourth proportional to 921.38, 1,271.37 and 528.34 is: 729.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.38 : 1,271.37 = 528.34 : x
  2. Step 2: Convert to fraction form
    921.38/1,271.37 = 528.34/x
  3. Step 3: Cross multiply
    921.38x = 1,271.37 × 528.34
  4. Step 4: Simplify right side
    921.38x = 671,715.63
  5. Step 5: Solve for x
    x = 671,715.63/921.38
  6. Step 6: Final answer
    x = 729.03

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Double scale
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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.