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Finding the Fourth Proportional to 920.74, 1,270.74 and 527.80

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Solution

The fourth proportional to 920.74, 1,270.74 and 527.80 is: 728.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.74 : 1,270.74 = 527.80 : x
  2. Step 2: Convert to fraction form
    920.74/1,270.74 = 527.80/x
  3. Step 3: Cross multiply
    920.74x = 1,270.74 × 527.80
  4. Step 4: Simplify right side
    920.74x = 670,696.57
  5. Step 5: Solve for x
    x = 670,696.57/920.74
  6. Step 6: Final answer
    x = 728.43

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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.