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Finding the Fourth Proportional to 1,288.12, 1,930.74 and 556.60

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Solution

The fourth proportional to 1,288.12, 1,930.74 and 556.60 is: 834.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.12 : 1,930.74 = 556.60 : x
  2. Step 2: Convert to fraction form
    1,288.12/1,930.74 = 556.60/x
  3. Step 3: Cross multiply
    1,288.12x = 1,930.74 × 556.60
  4. Step 4: Simplify right side
    1,288.12x = 1,074,649.88
  5. Step 5: Solve for x
    x = 1,074,649.88/1,288.12
  6. Step 6: Final answer
    x = 834.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.