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Finding the Fourth Proportional to 920.39, 1,270.37 and 571.37

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Solution

The fourth proportional to 920.39, 1,270.37 and 571.37 is: 788.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.39 : 1,270.37 = 571.37 : x
  2. Step 2: Convert to fraction form
    920.39/1,270.37 = 571.37/x
  3. Step 3: Cross multiply
    920.39x = 1,270.37 × 571.37
  4. Step 4: Simplify right side
    920.39x = 725,846.38
  5. Step 5: Solve for x
    x = 725,846.38/920.39
  6. Step 6: Final answer
    x = 788.63

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Double scale
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1.5x scale

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.