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Finding the Fourth Proportional to 670.28, 1,004.79 and 259.68

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Solution

The fourth proportional to 670.28, 1,004.79 and 259.68 is: 389.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.28 : 1,004.79 = 259.68 : x
  2. Step 2: Convert to fraction form
    670.28/1,004.79 = 259.68/x
  3. Step 3: Cross multiply
    670.28x = 1,004.79 × 259.68
  4. Step 4: Simplify right side
    670.28x = 260,923.87
  5. Step 5: Solve for x
    x = 260,923.87/670.28
  6. Step 6: Final answer
    x = 389.28

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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.