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Finding the Fourth Proportional to 668.65, 1,003.59 and 339.82

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Solution

The fourth proportional to 668.65, 1,003.59 and 339.82 is: 510.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.65 : 1,003.59 = 339.82 : x
  2. Step 2: Convert to fraction form
    668.65/1,003.59 = 339.82/x
  3. Step 3: Cross multiply
    668.65x = 1,003.59 × 339.82
  4. Step 4: Simplify right side
    668.65x = 341,039.95
  5. Step 5: Solve for x
    x = 341,039.95/668.65
  6. Step 6: Final answer
    x = 510.04

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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.