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Finding the Fourth Proportional to 1,194.40, 1,648.08 and 728.80

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Solution

The fourth proportional to 1,194.40, 1,648.08 and 728.80 is: 1,005.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,194.40 : 1,648.08 = 728.80 : x
  2. Step 2: Convert to fraction form
    1,194.40/1,648.08 = 728.80/x
  3. Step 3: Cross multiply
    1,194.40x = 1,648.08 × 728.80
  4. Step 4: Simplify right side
    1,194.40x = 1,201,120.70
  5. Step 5: Solve for x
    x = 1,201,120.70/1,194.40
  6. Step 6: Final answer
    x = 1,005.63

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1.5x scale

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.