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Finding the Fourth Proportional to 1,323.98, 1,985.28 and 665.18

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Solution

The fourth proportional to 1,323.98, 1,985.28 and 665.18 is: 997.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,323.98 : 1,985.28 = 665.18 : x
  2. Step 2: Convert to fraction form
    1,323.98/1,985.28 = 665.18/x
  3. Step 3: Cross multiply
    1,323.98x = 1,985.28 × 665.18
  4. Step 4: Simplify right side
    1,323.98x = 1,320,568.55
  5. Step 5: Solve for x
    x = 1,320,568.55/1,323.98
  6. Step 6: Final answer
    x = 997.42

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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.