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Finding the Fourth Proportional to 1,272.62, 1,906.86 and 655.40

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Solution

The fourth proportional to 1,272.62, 1,906.86 and 655.40 is: 982.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.62 : 1,906.86 = 655.40 : x
  2. Step 2: Convert to fraction form
    1,272.62/1,906.86 = 655.40/x
  3. Step 3: Cross multiply
    1,272.62x = 1,906.86 × 655.40
  4. Step 4: Simplify right side
    1,272.62x = 1,249,756.04
  5. Step 5: Solve for x
    x = 1,249,756.04/1,272.62
  6. Step 6: Final answer
    x = 982.03

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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.