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Finding the Fourth Proportional to 1,192.20, 1,645.18 and 720.20

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Solution

The fourth proportional to 1,192.20, 1,645.18 and 720.20 is: 993.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,192.20 : 1,645.18 = 720.20 : x
  2. Step 2: Convert to fraction form
    1,192.20/1,645.18 = 720.20/x
  3. Step 3: Cross multiply
    1,192.20x = 1,645.18 × 720.20
  4. Step 4: Simplify right side
    1,192.20x = 1,184,858.64
  5. Step 5: Solve for x
    x = 1,184,858.64/1,192.20
  6. Step 6: Final answer
    x = 993.84

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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.