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Finding the Fourth Proportional to 670.05, 1,004.89 and 259.06

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Solution

The fourth proportional to 670.05, 1,004.89 and 259.06 is: 388.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.05 : 1,004.89 = 259.06 : x
  2. Step 2: Convert to fraction form
    670.05/1,004.89 = 259.06/x
  3. Step 3: Cross multiply
    670.05x = 1,004.89 × 259.06
  4. Step 4: Simplify right side
    670.05x = 260,326.80
  5. Step 5: Solve for x
    x = 260,326.80/670.05
  6. Step 6: Final answer
    x = 388.52

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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.