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Finding the Fourth Proportional to 1,197.60, 1,796.40 and 711.20

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Solution

The fourth proportional to 1,197.60, 1,796.40 and 711.20 is: 1,066.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,197.60 : 1,796.40 = 711.20 : x
  2. Step 2: Convert to fraction form
    1,197.60/1,796.40 = 711.20/x
  3. Step 3: Cross multiply
    1,197.60x = 1,796.40 × 711.20
  4. Step 4: Simplify right side
    1,197.60x = 1,277,599.68
  5. Step 5: Solve for x
    x = 1,277,599.68/1,197.60
  6. Step 6: Final answer
    x = 1,066.80

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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.