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Finding the Fourth Proportional to 920.12, 1,268.72 and 847.20

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Solution

The fourth proportional to 920.12, 1,268.72 and 847.20 is: 1,168.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.12 : 1,268.72 = 847.20 : x
  2. Step 2: Convert to fraction form
    920.12/1,268.72 = 847.20/x
  3. Step 3: Cross multiply
    920.12x = 1,268.72 × 847.20
  4. Step 4: Simplify right side
    920.12x = 1,074,859.58
  5. Step 5: Solve for x
    x = 1,074,859.58/920.12
  6. Step 6: Final answer
    x = 1,168.17

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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.