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Finding the Fourth Proportional to 991.99, 1,368.40 and 632.41

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Solution

The fourth proportional to 991.99, 1,368.40 and 632.41 is: 872.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.99 : 1,368.40 = 632.41 : x
  2. Step 2: Convert to fraction form
    991.99/1,368.40 = 632.41/x
  3. Step 3: Cross multiply
    991.99x = 1,368.40 × 632.41
  4. Step 4: Simplify right side
    991.99x = 865,379.84
  5. Step 5: Solve for x
    x = 865,379.84/991.99
  6. Step 6: Final answer
    x = 872.37

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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.