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Finding the Fourth Proportional to 988.72, 1,365.07 and 634.81

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Solution

The fourth proportional to 988.72, 1,365.07 and 634.81 is: 876.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.72 : 1,365.07 = 634.81 : x
  2. Step 2: Convert to fraction form
    988.72/1,365.07 = 634.81/x
  3. Step 3: Cross multiply
    988.72x = 1,365.07 × 634.81
  4. Step 4: Simplify right side
    988.72x = 866,556.91
  5. Step 5: Solve for x
    x = 866,556.91/988.72
  6. Step 6: Final answer
    x = 876.44

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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.