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Finding the Fourth Proportional to 991.25, 1,368.50 and 758.81

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Solution

The fourth proportional to 991.25, 1,368.50 and 758.81 is: 1,047.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.25 : 1,368.50 = 758.81 : x
  2. Step 2: Convert to fraction form
    991.25/1,368.50 = 758.81/x
  3. Step 3: Cross multiply
    991.25x = 1,368.50 × 758.81
  4. Step 4: Simplify right side
    991.25x = 1,038,431.49
  5. Step 5: Solve for x
    x = 1,038,431.49/991.25
  6. Step 6: Final answer
    x = 1,047.60

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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.