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Finding the Fourth Proportional to 1,313.52, 1,971.50 and 664.71

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Solution

The fourth proportional to 1,313.52, 1,971.50 and 664.71 is: 997.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.52 : 1,971.50 = 664.71 : x
  2. Step 2: Convert to fraction form
    1,313.52/1,971.50 = 664.71/x
  3. Step 3: Cross multiply
    1,313.52x = 1,971.50 × 664.71
  4. Step 4: Simplify right side
    1,313.52x = 1,310,475.77
  5. Step 5: Solve for x
    x = 1,310,475.77/1,313.52
  6. Step 6: Final answer
    x = 997.68

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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.