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Finding the Fourth Proportional to 988.98, 1,364.09 and 634.99

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Solution

The fourth proportional to 988.98, 1,364.09 and 634.99 is: 875.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.98 : 1,364.09 = 634.99 : x
  2. Step 2: Convert to fraction form
    988.98/1,364.09 = 634.99/x
  3. Step 3: Cross multiply
    988.98x = 1,364.09 × 634.99
  4. Step 4: Simplify right side
    988.98x = 866,180.33
  5. Step 5: Solve for x
    x = 866,180.33/988.98
  6. Step 6: Final answer
    x = 875.84

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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.