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Finding the Fourth Proportional to 1,115.04, 1,538.26 and 642.84

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Solution

The fourth proportional to 1,115.04, 1,538.26 and 642.84 is: 886.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.04 : 1,538.26 = 642.84 : x
  2. Step 2: Convert to fraction form
    1,115.04/1,538.26 = 642.84/x
  3. Step 3: Cross multiply
    1,115.04x = 1,538.26 × 642.84
  4. Step 4: Simplify right side
    1,115.04x = 988,855.06
  5. Step 5: Solve for x
    x = 988,855.06/1,115.04
  6. Step 6: Final answer
    x = 886.83

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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.