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Finding the Fourth Proportional to 920.97, 1,270.89 and 528.12

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Solution

The fourth proportional to 920.97, 1,270.89 and 528.12 is: 728.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.97 : 1,270.89 = 528.12 : x
  2. Step 2: Convert to fraction form
    920.97/1,270.89 = 528.12/x
  3. Step 3: Cross multiply
    920.97x = 1,270.89 × 528.12
  4. Step 4: Simplify right side
    920.97x = 671,182.43
  5. Step 5: Solve for x
    x = 671,182.43/920.97
  6. Step 6: Final answer
    x = 728.78

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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.