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Finding the Fourth Proportional to 986.65, 1,361.56 and 538.51

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Solution

The fourth proportional to 986.65, 1,361.56 and 538.51 is: 743.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.65 : 1,361.56 = 538.51 : x
  2. Step 2: Convert to fraction form
    986.65/1,361.56 = 538.51/x
  3. Step 3: Cross multiply
    986.65x = 1,361.56 × 538.51
  4. Step 4: Simplify right side
    986.65x = 733,212.67
  5. Step 5: Solve for x
    x = 733,212.67/986.65
  6. Step 6: Final answer
    x = 743.13

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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.