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Finding the Fourth Proportional to 986.79, 1,361.82 and 654.65

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Solution

The fourth proportional to 986.79, 1,361.82 and 654.65 is: 903.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.79 : 1,361.82 = 654.65 : x
  2. Step 2: Convert to fraction form
    986.79/1,361.82 = 654.65/x
  3. Step 3: Cross multiply
    986.79x = 1,361.82 × 654.65
  4. Step 4: Simplify right side
    986.79x = 891,515.46
  5. Step 5: Solve for x
    x = 891,515.46/986.79
  6. Step 6: Final answer
    x = 903.45

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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.