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Finding the Fourth Proportional to 1,199.81, 1,654.22 and 986.34

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Solution

The fourth proportional to 1,199.81, 1,654.22 and 986.34 is: 1,359.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,199.81 : 1,654.22 = 986.34 : x
  2. Step 2: Convert to fraction form
    1,199.81/1,654.22 = 986.34/x
  3. Step 3: Cross multiply
    1,199.81x = 1,654.22 × 986.34
  4. Step 4: Simplify right side
    1,199.81x = 1,631,632.02
  5. Step 5: Solve for x
    x = 1,631,632.02/1,199.81
  6. Step 6: Final answer
    x = 1,359.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.