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Finding the Fourth Proportional to 992.79, 1,369.44 and 638.59

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Solution

The fourth proportional to 992.79, 1,369.44 and 638.59 is: 880.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.79 : 1,369.44 = 638.59 : x
  2. Step 2: Convert to fraction form
    992.79/1,369.44 = 638.59/x
  3. Step 3: Cross multiply
    992.79x = 1,369.44 × 638.59
  4. Step 4: Simplify right side
    992.79x = 874,510.69
  5. Step 5: Solve for x
    x = 874,510.69/992.79
  6. Step 6: Final answer
    x = 880.86

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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.