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Finding the Fourth Proportional to 991.25, 1,479.42 and 880.28

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Solution

The fourth proportional to 991.25, 1,479.42 and 880.28 is: 1,313.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.25 : 1,479.42 = 880.28 : x
  2. Step 2: Convert to fraction form
    991.25/1,479.42 = 880.28/x
  3. Step 3: Cross multiply
    991.25x = 1,479.42 × 880.28
  4. Step 4: Simplify right side
    991.25x = 1,302,299.44
  5. Step 5: Solve for x
    x = 1,302,299.44/991.25
  6. Step 6: Final answer
    x = 1,313.80

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.