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Finding the Fourth Proportional to 1,124.80, 1,549.92 and 829.60

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Solution

The fourth proportional to 1,124.80, 1,549.92 and 829.60 is: 1,143.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.80 : 1,549.92 = 829.60 : x
  2. Step 2: Convert to fraction form
    1,124.80/1,549.92 = 829.60/x
  3. Step 3: Cross multiply
    1,124.80x = 1,549.92 × 829.60
  4. Step 4: Simplify right side
    1,124.80x = 1,285,813.63
  5. Step 5: Solve for x
    x = 1,285,813.63/1,124.80
  6. Step 6: Final answer
    x = 1,143.15

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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.