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Finding the Fourth Proportional to 1,820.32, 2,728.80 and 725.45

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Solution

The fourth proportional to 1,820.32, 2,728.80 and 725.45 is: 1,087.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,820.32 : 2,728.80 = 725.45 : x
  2. Step 2: Convert to fraction form
    1,820.32/2,728.80 = 725.45/x
  3. Step 3: Cross multiply
    1,820.32x = 2,728.80 × 725.45
  4. Step 4: Simplify right side
    1,820.32x = 1,979,594.32
  5. Step 5: Solve for x
    x = 1,979,594.32/1,820.32
  6. Step 6: Final answer
    x = 1,087.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.