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Finding the Fourth Proportional to 719.96, 1,079.93 and 617.90

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Solution

The fourth proportional to 719.96, 1,079.93 and 617.90 is: 926.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.96 : 1,079.93 = 617.90 : x
  2. Step 2: Convert to fraction form
    719.96/1,079.93 = 617.90/x
  3. Step 3: Cross multiply
    719.96x = 1,079.93 × 617.90
  4. Step 4: Simplify right side
    719.96x = 667,284.89
  5. Step 5: Solve for x
    x = 667,284.89/719.96
  6. Step 6: Final answer
    x = 926.84

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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.