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Finding the Fourth Proportional to 1,320.37, 1,979.64 and 670.66

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Solution

The fourth proportional to 1,320.37, 1,979.64 and 670.66 is: 1,005.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.37 : 1,979.64 = 670.66 : x
  2. Step 2: Convert to fraction form
    1,320.37/1,979.64 = 670.66/x
  3. Step 3: Cross multiply
    1,320.37x = 1,979.64 × 670.66
  4. Step 4: Simplify right side
    1,320.37x = 1,327,665.36
  5. Step 5: Solve for x
    x = 1,327,665.36/1,320.37
  6. Step 6: Final answer
    x = 1,005.53

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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.