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Finding the Fourth Proportional to 670.25, 1,005.21 and 259.12

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Solution

The fourth proportional to 670.25, 1,005.21 and 259.12 is: 388.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.25 : 1,005.21 = 259.12 : x
  2. Step 2: Convert to fraction form
    670.25/1,005.21 = 259.12/x
  3. Step 3: Cross multiply
    670.25x = 1,005.21 × 259.12
  4. Step 4: Simplify right side
    670.25x = 260,468.72
  5. Step 5: Solve for x
    x = 260,468.72/670.25
  6. Step 6: Final answer
    x = 388.62

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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.