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Finding the Fourth Proportional to 849.60, 1,272.78 and 617.90

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Solution

The fourth proportional to 849.60, 1,272.78 and 617.90 is: 925.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    849.60 : 1,272.78 = 617.90 : x
  2. Step 2: Convert to fraction form
    849.60/1,272.78 = 617.90/x
  3. Step 3: Cross multiply
    849.60x = 1,272.78 × 617.90
  4. Step 4: Simplify right side
    849.60x = 786,444.40
  5. Step 5: Solve for x
    x = 786,444.40/849.60
  6. Step 6: Final answer
    x = 925.66

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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.