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Finding the Fourth Proportional to 905.99, 1,250.30 and 556.79

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Solution

The fourth proportional to 905.99, 1,250.30 and 556.79 is: 768.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.99 : 1,250.30 = 556.79 : x
  2. Step 2: Convert to fraction form
    905.99/1,250.30 = 556.79/x
  3. Step 3: Cross multiply
    905.99x = 1,250.30 × 556.79
  4. Step 4: Simplify right side
    905.99x = 696,154.54
  5. Step 5: Solve for x
    x = 696,154.54/905.99
  6. Step 6: Final answer
    x = 768.39

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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.