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Finding the Fourth Proportional to 1,324.40, 1,985.99 and 665.87

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Solution

The fourth proportional to 1,324.40, 1,985.99 and 665.87 is: 998.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,324.40 : 1,985.99 = 665.87 : x
  2. Step 2: Convert to fraction form
    1,324.40/1,985.99 = 665.87/x
  3. Step 3: Cross multiply
    1,324.40x = 1,985.99 × 665.87
  4. Step 4: Simplify right side
    1,324.40x = 1,322,397.90
  5. Step 5: Solve for x
    x = 1,322,397.90/1,324.40
  6. Step 6: Final answer
    x = 998.49

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1.5x scale

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.