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Finding the Fourth Proportional to 781.72, 1,172.72 and 370.64

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Solution

The fourth proportional to 781.72, 1,172.72 and 370.64 is: 556.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.72 : 1,172.72 = 370.64 : x
  2. Step 2: Convert to fraction form
    781.72/1,172.72 = 370.64/x
  3. Step 3: Cross multiply
    781.72x = 1,172.72 × 370.64
  4. Step 4: Simplify right side
    781.72x = 434,656.94
  5. Step 5: Solve for x
    x = 434,656.94/781.72
  6. Step 6: Final answer
    x = 556.03

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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.